None of these are the most infuriating, but when people bash music or someone's musical tastes or someone for their musical tastes. When people complain about a bumped thread, especially when the bump adds to the conversation. When people devote an entire post to fixing a grammatical mistake. When people "fix" it by making another mistake, especially when it was originally correct. When people don't accept other region's spelling or grammar rules. Excessive profanity. Slurs of all kinds, except musical.
