People who ask me to take my shoes off, whether at their homes, offices, or even airport security.
I have actually walked out on meetings because when I reached, the office required me to be shoeless (and I was wearing a suit). Not any more. I am more charitable now. But at home, we wear footwear. All the time. And we not only do not insist that people take theirs off, but we also insist that they keep them on.
What’s yours?
By the way, here’s an excellent article written on this subject back in 2012 by the inimitable and stubborn Narendra Nayak.