Can male soldiers wear lipstick, earrings and ripped clothes while off duty, but on post?

As long as it is not offensive or demeaning they can wear what they want. No, there is an exception as the Base may have a policy on what you can wear. I know Fort Stewart had it posted in the PX on what was expectable civilian wear.

After reading the regs, there is also NO update that says they cannot, that is unless it is post policy, that goes against Army regs, per Section 1.13 Page 9.

SGT Colin Gunter, you were in the wrong for harassing that little goth millennial. Have you no shame? I mean seriously, did it make you die, hurt you in any way? Would my own torn Levi's black boots, leather jacket and t-shirt with a red and white bandana showing Hells Angels Nomads association force you to err the same had you seen me, or do you just have a hard on for goth's and give bikers a pass? }
As a former Staff Sergeant, I never messed with my people when they were off. Why? Last I checked, we signed that same paper to fight for freedom and liberty and justice for all. We trained them hard as fuck, so when it came to their highly valued off time, we let them play hard as long as they were not getting into trouble doing drugs or DUI

I see this as nothing new, our young troops are more forward in their ways of expressions. We have rules on base, just like on duty compared to off duty. These rules are there not only for uniformity and image but for security as well. Once they join they make a commitment to stay within these rules, guidelines and regulations. They are not there to put anyone's beliefs down nor to discriminate. We are all part of "ONE" team and chose to take this path. Many people once in get very comfortable with their surrounding and tend to put their positions on hold. To me they want to forget where they are for a while. In saying this, on base is not a place for this unleashing the inner self. Corrective leadership is needed here to remind them. Now I might seem old fashion and I am to a point but I also believe in learning and staying with new ways and ideas to keep up with society.

Depends...are they moonlighting in a 70's hair band?

One. Command establishes dress policy.
Two. Uniformity is priority in units
Three. No sissy’s will be tolerated.
Four. You are in the military, get your head screwed on right or face mental evaluation and discharge.

Have we come so far away from our roots that this type of behavior is acceptable while on-post?

As long as everyone wears it

Off duty? Who cares.

Long as they're squared away when it's time to work, they aren't breaking UCMJ, or they aren't doing anything particularly unethical or dangerous; fuck off out of their business.

Why would they want to ?

I would hope not. but I was in and got out 41 years ago. so my opinion doesn't mean squat, I believe