BDUs I understand, cheap, comfortable, durable, and easy to clean.
Boots, sure, same reason as the BDUs, I wear my old work boats, so I see no difference for 'combat' boots.
LBVs, webgear, well if you're shooting some kind of match, sure. If not, well maybe a bit overboard. BUT, if you don't have a bench nearby, it is better than stuffing 6+ mags in your pockets.
Interceptors/body armor, not unless I felt I might get shot at, or I needed the exercise. That shit is so uncomfortable and HOT. But when I lived in CO and went off into BLM to shoot, I did sometimes wear a concealable vest. There was a lot of shooting from unknown directions, so I though it was a good idea. Also ran into a couple shady folks sometimes, so I felt a little more comfortable with the vest on.
Helmets, well that one might make me giggle a bit.
That being said, none of it really bothers me. As long as everyone is shooting safe, they can wear whatever they want.