Luckily I haven't experienced this on this site yet, but; It pisses me off when a person derails an RP to chase after pity from others, or starts to incorporate their bad mood into their IC posts. The last RP I ever GM'd before using RPG again, I had the ball running and the OOC lit up with friendly discussion, but one guy was having some emotional issues and we all offered our support, went as far as to start PM'ing him, but he ignored them and told us in the OOC that it was a better place to vent for some reason. Anyway, eventually it became a daily affair to vent at us in OOC and around the same time his posts IC started to take a similar perspective. Suddenly his character become this lone-wolf type who was always unreasonably sad.

I have no personal gripes with the guy and I hope the best for him, but his conduct was quite childish. Especially considering I(and others, I'm sure) offered support away from the RP if all he wanted to do was vent. I honestly do not see the use in forming an association with your problems to a fun hobby such as RP by digging up issues during the time you've set aside for posting in the place that you post.