I am on the autism spectrum and I tend to point at things, including people.
The other day, I was talking with a coworker about some tasks I needed them to do and, while I was talking, I was also pointing at them (it was an unconscious way of emphasizing the "you" part).
Upon seeing that, my manager told me to "not point at people" (because it was "rude") even though my coworker didn't seem to be annoyed by it.
So, why is it that society finds it rude to point at people? What's the harm in doing that?
Another situation is when someone is far away and surrounded by multiple people. In those instances, I find it really useful to be able to point in order to tell someone else "here is the person we are looking for/talking about". (the person I am pointing may or may not be able to hear what I am saying.)
However, doing this is also frowned upon by society. Why is that?