yes, It happens. Just like rude users there also are rude developers. Once I tried the demo of a small CRM,I filed the bug related to it. Later Developer rudely showered me with comments like I am asking for free goodies and closed issue, and I later replaced my CRM with custom WordPress plugin ;).

My suggestions to fellow developers; Every bug, feature request and question (good FAQ candidates) is the contributions, if you are not interested in accepting, just be upfront and polite.