Yeah I agree, if seeing a small number next to someone's nick predisposes you to being offhand with them, then that is all the more reason to hide this feature. The amount a person posts means nothing. A small post count could mean the person always finds his help in the help file first.
Also the post count isn't detailed enough to assist those kind of judgements, You can't tell if a person has made a thousand feature suggestions, and only 1 helpful reply to someone, for example.
Khaled for instance, has a very low post count. Can something negative about him be inferred from that also?