A few of my pet peeves, more to follow soon!
1. Using "anyways" instead of "anyway".
2. The phrase "My bad".
It sounds so terribly incomplete somehow, without a follow-up noun to the phrase.
I'm rather surprised to discover that Shakespeare used it too, apparently:
"our love and pity doth the impression fill
Which vulgar scandal stamp'd upon my brow;
For what care I who calls me well or ill,
So you o'er-green my bad, my good allow?"
3. Incorrect use of archaic English.
4. Incorrect use of French.(Or Spanish, or Italian, or Japanese, for that matter.)
I see this in a lot of shop/restaurant signs, blogs etc. I met a Frenchman
recently, and he said he was bemused to see boards blithely peppered with "la" and "le" and even " l' ", without thought for whether the noun following the pronoun was actually feminine, masculine or starting with a vowel.
5. People who've learnt British English (and spellings) throughout school suddenly switching
to American English. Yes, even those who're still in India.
6. SMS-speak. (shudder.)
7. People using "loose" when they mean "lose".
8. Corporate-speak . ("on the same page", "paradigm shift", "revert back")
9. Nouns turned into verbs. ("He lunched at noon.", "Loan me a fiver.")
10. Incorrect use of apostrophes. (It's, its, its')