People not rolling loot, it wastes everybodys time
Jump spammers get real old real fast
Couples (creepy hubby bullsh*t if I'm irritated) can be creepy and strange at times cause I feel it should be done somewhere privacy. It's especially weird if one's bio says something like "property of so&so" or "return to so&so when lost".
People pulling bosses/mobs when I'm taking, not everyone is in as much of a rush as you
People instantly leaving dungeons, this shows that you had a bad experience because you absolutely have the time to type gg in chat as it takes a second on both console and PC no matter how much of a rush you're in. And you might miss out on a few commends too!
Emote spammers, they flood the chat and prevent me from clearly reading a chat log. This would be especially bad in something like a FC or the novice network.