I generally only play single-player.
However, I do like winning sometimes, but mostly it just matters if I am enjoying myself. If I am having a good enough time playing with others and everyone is laid back, I don't mind if we lose a few games. Sometimes you have a good gaming session, and sometimes you have a bad one. I usually stop playing multi-player games when 'winning' has very obviously overridden 'fun'. Or we get the Team Captain that no one appointed and eventually also turns into Captain Obvious. Someone yelling at me, whether it's my fault or not, does not a fun time make. It may be time for Captain McRagey-Pants to find another hobby.