I like grammar, and I don't care if you think they're annoying.
If you're on the internet, at least act like you're smart. Don't type like "lulz" or "l00000l" or even just complete misspellings.
I for one don't really mind "lol", "k", and then "afk/brb". Because thats just the way some people talk nowadays. But if you talk like you're stupid, then we have some worht freaking out about it.