How would you react if you were on a flight where a family was boo'd for being allowed off the plane first to receive their soldier's body?

I would respond the same way I did when I came home on leave after my first deployment during Vietnam (1972) where I was called a vile baby killer and spot on. I just considered the source, laughed and moved on. Over a 21 year career I pulled into many ports of call. The only plot of call I ever pulled into where we were not welcome was right here in the good ole US of A (1986). Your always going to find those who don't care or respect what sacrifices military personnel make for the country. Nothing new!

I'd need help off the plane after I buried my foot up someones ass...

I'd probably stand up, turn around, look at the offending party and let them know they have no class nor right to do what they just did. If that didn't work to shut them up, then I would say something much more simple, "Hey fuck stick, shut the fuck up."

I would probably get in a disagreement

I would simply, and calmly, remind them that the service member died for their right to boo.

Did you actually witness this? Or are you just drumming up a hypothetical situation, trying to stir the pot?

I would tell them in a loud clear voice that it was this family's soldier who allowed them to live in a free country. So shut the F*ck up

Don't go there, please. Was on emergency leave in '78, Death of Spouse, from Germany to CONUS. In the belly of FRED was the casket of a fallen one. I paid my respects as I climbed the ladder to the passenger compartment and wondered what was instore for the loved ones once the left the confines of Dover AFB. I can only hope that their experiences were not as traumatic as the ones I experienced in '74. I've friends and loved ones that are "Gold Star" families and have shared their angst at having to explain to the uninformed the significance of a "Gold Star".

Wow! It is hard to fathom this actually happening, but in today's polarized society it is believable. My reaction would have been somewhere between outrage and stony silence as I contemplated various way to rip the offending parties to shreds. For a guy who once took a fallen soldier home from El Salvador I cannot even imagine how horrific it must have been!

I would demand those doing so have respect and common decency.