Bunch of potheads.
Apparently they were yelling “F*ck the Mormons.” Rude, insulting and obscene.
Perhaps next time they should just yell “F*ck Trump” and they’d be OK, since you also apparently can wear a sweatshirt with that on an airplane flight.
You can’t apologize for others
So, Sanders does the right, even classy thing here, and I see (some people commenting below and elsewhere) a (thankfully few) haters just have to show their rears.
I’m no big fan of Sanders - I’m pretty ambivalent, really - but, hating on people when they do something good sure isn’t going to lead to a better culture / society. :-(