This was my first MMORPG.. like... ever. So when I started, I had NO clue what people were talking about when they were speaking in lingo. My first few dungeons were a disaster, and it only made it worse when people were telling me what to do, using words that I didn't know.. and then getting mad when I wasn't doing it.
Obviously I picked it up and started getting better. But now I go into a dungeon and there'll be a newbie and they're terrible at their job, the first thing i do when someone starts getting irritated and demanding that they generate more enmity, is break it down for them. MAYBE they don't know what that means and why they need to do so.. because playing the game solo you don't need to worry about ANY of that.
My first time tanking was so horrible and the people were SO mean that I almost cried. And I'm still scared to play dungeons as a gladiator, even though I know what to do now.
Try to be helpful rather than hurtful.