They weren't nude and a dude wearing a dress is not the same as them exposing themselves. Nice try with a false equivalency argument.
Also, shouldn't matter if you are not okay with it. Sounds like a "you" problem that you need to cope with instead of forcing others to conform to your sensibilities. Again, so long as they aren't harming anyone, then you can shove off with your judgement of their differences.
If it makes you uncomfortable, stop looking.