Nothing annoys me more than when I personally make careless mistakes – like using the wrong ‘your’ or writing ‘diffuse’ when I mean ‘defuse’ or ‘effect’ when I mean ‘affect.’ I hate that. Nothing annoys me more than my own errors. There is nothing that anyone could ever write that could possibly annoy me more than my own shortcomings. Especially when I know better and/or when I think I’m being careful. I cringe just thinking about it. However, I do find text/IM jargon mildly irritating.