Be worried. I think of myself of as rather kind and forgiving usually. Dota however turns me into a scumbag and it makes me feel horrible after. It's primarily because I play video games to wind down and have fun and in dota when another person is just feeding and is the whole reason you're losing... after a stressful day you can snap. I feel like you need to be pretty thick skinned to play any game where there's team pvp. If you dont like dealing with people's horrid attitudes (and there is no reason you should!) you might wanna avoid this. I will say that the dota community is miles ahead of the league of legends community as far being friendlier. But that doesn't say much...