People can be terribly tribal.I must say I don't buy this resentment of "the wrong kind of cyclist", who wears the wrong kit. CC can be terribly tribal.
More people cycling is a good thing. It means the person driving the white van/4WD panzer/LGV/any little car has a greater chance of knowing what it's like to be on two wheels and, hopefully, will be a little bit more careful. I guess that's tribalism working in a good way.

I enjoy my cycling my way and if some lycra clad whizz kid overtakes me so what, that's him / her enjoying themselves. Maybe when they are pushing 73, they will revert to my ways.