Not particularly those, but yeah I use 'grammatically incorrect words and phrases' all the time.

"I could care less" sounds ridiculous to me as it it implies that you DO care. "I couldn't care less" says that the issue is so futile in your mind that it couldn't get any more insignificant.

Sometimes I like to say "irregardlessly" (unless it's a job interview or something). Another favorite is when someone says something like, "That's the greatest blah blah of all time!" So this is as good as it's ever going to get? Shit.

I don't use either, but I sort of wish "irregardless" was a word. For some reason, I like how it sounds.

I can't stand "irregardless". I used to work with someone who used it non-stop and it always seemed like she liked to use it to sound smart. So, it was annoying as hell. "Irregardless" is becoming accepted because of its wide use. It even has its own Wiki page:
http://en.wikipedia.org/wiki/Irregardless

We've all got pet peeves about posters whose grammar just doesn't cut it. What're yours?

1. Not knowing the difference between "there," "they're" and "their"
2. Same for "your" and "you're," and "too" and "to"
3. Too many commas
4. Run-on sentences
5. Long posts that aren't separated into paragraphs
6. Misspelling of the word "definitely"
7. "Textwrite" Do u fllw me?

I'm with you on they're/their, you're/your and the text crap, that stuff just irks me to no end. And I'm sure I do an occasional one of them myself but it's very rare. I don't pride myself on being a grammar Nazi though I probably am but I write stuff for online where 'there is no excuse for poor grammar and/or spelling', AND I did pretty much have it pounded into me every single year in school to boot.

I’m less critical of grammar and spelling errors in the informal context of message board posts than I would be for mistakes on a professional level such as reports, memos, etc. I know I’ve caught myself using “your “ when it should be “you’re” because I might have been trying to right (sic) too fast and my mind was on autopilot. Some errors could be due to being up too late or typing by the light of their monitor. I usually try to preview my posts because it’s easier for me to proof read that way.

What bothers me the most online are one long paragraph, run on sentences and text talk.

Text write is the one that annoys me the most. I mean, seriously. I'm guilty of shortening my words....I'll text "u" instead of "you" and "4" instead of "for" but I can't stand to see "cum" instead of "come", "be4" instead of "before", etc. I also hate it when they don't feel the need to use punctuation marks just because it's a text. I text the way I type. It's not that hard to do.

I like 'irregardless' too; I think the one that irks me is 'guestimate.' Don't do that.

I also don't care for 'fixing to.' I'm fixing to go to the store.

Two grammar pet-peeves:

1) - Improper use of the semi-colon. Just because Microsoft Word tells you to put in a semi-colon doesn't mean that it's even remotely correct.

Correct usage: Microsoft Word sucks at grammar; don't listen to it.

Incorrect usage: Microsoft Word suck; at grammar; don't use it.

2) - Misplaced modifiers.

Example of an MM: Peter bought a shirt at the mall with fishes on it.

So, Peter went to a mall with fishes painted onto it? Or did the shirt have the fishes on it?