I am sure as we are dealing with human beings bias can be an issue, mostly the ones who get trouble from other users have Invited it in the past. There are those who seem to assume some degree of superiority and there is a fair bit of patronising and put downs. Sadly much of this comes from not understanding where the other person is coming from or not caring.
Luckily we are all responsible for our own behaviour and can only try to use the site as it was intended. (I am not always the nicest but I accept that some people will p### me off)