Having people who openly call themselves beginner defame me in public forums, for no reason other than they didn't like my tone of voice or the points made because it pushed them out of their comfort zone. (like Faust on the FFMJ forums, if you need an example)
A pity, because you never move on from beginner to intermediate if you can't criticize others' play or your own.
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I do have another one though: LCD (Lowest common denominator) Mahjong. People playing under multiple rulesets creating the unified holy trinity of "honitsu, flushes, yakuhai, or one yaku+dora (riichi only or say silent pinfu)" or mistakes like "chanta, dora, no pons", where "no pons" is not a yaku following a lack of comprehension of the rules specific to the game being played in front of you. Overall, it sucks to be beaten by a strategy that basically denies the richness of the game, the poker equivalent being going all in for any suited connectors (2,3-hearts) because connectors look pretty, even if the strategy employed is -EV in the long run, people will be comforted if the blips occur when they savour them the most.
