If it's online, when they misspell words in an atrocious manner or have terrible grammar. I'm not a grammar nazi, but it really bothers me when you can't even bother to use proper English when talking.
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Boi dun maek me hurt u
Dew yew evon lift, bruh? I bett u lift twigz, yo
Dayum. Madd rezpekt, fam
Lets do it again some day lol