I never have an issue with this and personally will happily take socks off, especially to sleep because my feet get very hot on aircraft. I don’t ever walk around barefoot because I think the floor is grubby and there’s the possibility of standing on something sharp.
What I find more offensive is that some people actually feel their superior views usurp those of others and then feel the need to judge, especially in a public forum. We are all entitled to our views, but we are all living on the same planet and were not born with one rule book that said we all had to be a certain way.
I suggest next time somebody offends on an aircraft, send them good positive thoughts and maybe you’ll be less offended by their actions.