Four things for me.
1. People who think 10-15 year old boy gamers are all a bunch of useless immature idiots with no life. True, most of them ARE useless immature idiots with no life and I agree with all of your posts as I hate them too. However, I'm 13 and unlike the majority of my peers I was born with the gift of a functioning brain. There are a few others like myself, though not enough to get noticed very often. I just hate it when older people shun me the instant I mention my age without giving me the chance to prove myself. And even if I do prove myself, the instant they realise I'm technically a child everything gets awkward.
2. 10-15 year old male gamers who are nothing but a bunch of useless immature idiots with no life.
3. People with poor sportsmanship. (which sounds odd in the gaming context. Shouldn't we call it gamesmanship?)
4. Text talk. Now I understand if you're in the middle of a heated battle and can only type 'w8 a min' but if everything is calm and quiet you can at least learn how to communicate without using a demented form of code.
Also, whoever this Swift person is, I highly suggest he stop making odd posts which have nothing to do with the topic in question and only offer useless links and I humbly request that he bugger off.