Sam2 -“Health: One more than 1 occasion I have been not counted for a Minyan, (presumably) due to me wearing a colored shirt. I would hope that everyone thinks like you claim-that they only care if you follow Halachah. However, my experience (and I think many others’ also) is that far too many care about other things than that.”
This is the first time EVER that I heard anybody make such a claim. And if I never heard such a thing -I definitely never saw such a thing.
So if it’s as common as you make it sound, don’t you think in my whole long life, Bli A’H, and I’m a FFB, that I would have at least heard about this?!?!