But again, the difference is that the entire (including non-tri) population would have an adverse reaction to the wife beater. In contrast, the miniscule tri (and perhaps running) population appears to be adverse to short over tights whereas the population at large I have NO doubt would (1) prefer a male to wear shorts over the tights and (2) cringe at the thought of the man in long tights with nothing else
I can only assume that everyone here voting for tights with nothing on top also blithely assumes that they look normal, perhaps even cool, riding outdoors with their cycling kits and/or trisuits.
Maybe it's a bit different on the other side of the ocean, but in the Netherlands almost every runner runs in tights. Without something over those tights. I don't see why you would put shorts on top of tights. If your junk shows, maybe people should try tights with a better quality fabric ;-)