Why is the boonie cap so demonized in the army?

Sr NCOs fight things like boonie caps because they are busybodies and need something to do.
I am a bit of a contrarian (no surprise, for those who know me).
One AT, I went the other way and ordered that the boonie cap was part of the uniform of the day. The Guard people in the contonement area went nuts, trying to talk about there was a Guard regulation (don't care, we're USAR... and it wasn't true) or a post commander edict (there wasn't) and who authorized it (this guy, with more stripes than you high-speed).
All of the kerfuffle was a lot of fun, frankly. And my troops loved it, especially when it was time for chow. "Refer all questions to the 1SG" was the order of the day, and very few would have the balls to roll up and question me.
Marys.

The best answer is that wearing it makes too much sense. The actual answer is that soldiers do not wear it correctly. They want to shape and form it to look like some Australian sergeants major. So instead of constantly correcting soldiers, leaders just decided to not even let anyone wear them. Pretty sad but that's the truth.

I've worn my boonie cap on three deployments just to piss off SGMs, CSMs and O-6s. Had one GO tell me he wished his CSM would let him wear his. The hat isn't a spec-ops thing designed to "break up the human form" (though it does that well), it's a Sun hat, period. It was designed to keep the sun of your face, ears and neck. Several years ago (before OIF/OEF) I took some of my engineers to do a humanitarian project in a southern latitude area and told my supply sergeant to order us some, had to explain to him they were authorized because the commander (me) said so and the CTA allowed it. Had a run in with some touring pouge of a SGM about it while we we there - he failed to notice the "hard hat required" sign on the construction site when he came to "educate me" on the "error of my ways". I told him to get lost (while wearing a full brim construction helmet). After he got back to the states an told on me, I got a phone call from the engineer group commander wanting to know how I'd ordered them because he wanted all of our engineers to have them (both boonies and the full brim hard hats)

I wore mine in Iraq and A-Stan, I wore initially it because it kept the sun off my neck and it was an issue piece of the uniform, I caught the occasional stink eye from a CSM or other SRNCO but in the end I also wore it to piss off the few dillwads that lacked critical thinking skills.

I keep seeing the lame answer "because some don't wear it correctly". That smacks of lazy leadership.

When I was a PSG, I targeted individuals specifically for their "sins" as well as their achievements. I am often amazed at the weak leadership that goes in for the old mass punishment schtick. If you have someone that repeatedly wears it incorrectly, make that soldier give a class on proper wear of the boonie and counsel. If the soldier continues, come up with some next level, creative form of corrective action and counseling. If the behavior continues, recommend UCMJ/Art 15. Counsel the soldier along the way.

Instead, the lazy, thoughtless leader decrees prohibition and that all should suffer because of a few doltish irreconcilables.

"Correctly," Bull Shit; they are in the fucking Boonies, who gives a rats ass how they wear it? Except some pencil-pushing, snot-nosed, Socialist, Adam Schiff look-a-like!

Good question. On a side note we had an E-7 that got a temporary profile to wear one after getting skin cancer on his head and neck That later turned into a permanent profile his last 2 years before he retired. He greatly enjoyed the hate and discontent he spread showing his profile every time someone called him outfit it

The boonie cap absolutely is the right tool for the job when forward-deployed or in the field. If they don't want military personnel to wear it, then it shouldn't be issued in the first place. When it is 125 degrees F outside and the sun-hot wind are baking-burning your head, it is ridiculous to tell military personnel not to wear this critical piece of headgear, especially when it is issued specifically for that purpose. Nobody cares what it looks like under those conditions - only functionality and protection matters to prevent unnecessary heat injuries. In fact, they should bring back DCUs for desert mobilizations. It is the perfect uniform for that environment, not all these other uniforms attempted since then.

the same reason some CSM makes a policy to wear a freaking reflective belt over your body armor.....

If you're complaining about not wearing the boobie cap count yourself luck you werent in before the late 00's. You were not allowed any sniveling gear until it was actually 32 degrees, and when you were allowed snivel gear everyone wore the exact same piece of snivel gear because it was the uniform put out by the 1SG or CSM.
As for the bonnie cap, I think it's just something people forget about in the bottom of their b bag. I do get super tired of correcting people that dont wear it properly. You're not crocodile dundee or a bonnie lass, you put the string in the god damn hat.