There’s some overlap here with this thread.
Was this compliment inappropriate?
The fact that if someone is (say) unusually tall or short or has a name like Adam West, if you comment on it or make a joke about it (especially the first time you meet them) you are an inexcusable dumbass.
But I am constantly amazed by the much broader phenomenon that most people are terrible at seeing the world from other people’s perspective. You see frequently on here - people write OPs asking for advice in which they seem completely incapable of understanding that many of the facts that are known to them are likely not known to their audience and are critically relevant.
The minority of people who can see the world from other people’s perspective tend to be good teachers.