It's probably different for everyone. I dont really have a problem with bad beats, if someone is making a mistake in calling me and hits his 2 outer or whatever, I'm sad but I realise I played the hand good and just had bad luck, so this usually wont make me tilt.

However I have a huge problem when I'm losing money over a longer period of time in a session (no matter if it's because of bad play or bad luck), because I will start to play hands I usually wouldnt play and I try to make more 'moves' in the wrong places because I'm trying to prove to myself I can outplay the other players.