Any game with a competitive element, especially for money, even if not big, hides such a drawback. Losing hits dominance (the desire to dominate) - one of the main human desires. Hence the violent reaction. This does not mean that these games are bad and that they should not be played, just that if possible, you should choose more adequate opponents. I also play poker and I notice the same thing. Through every word, mate and aggression, because of any mistake, a huge number of bad words fly in your direction. Well, one friend told me that this is how he relaxes, a very strange way of course.