These errors jump out at me and give me the itchies. They distract me and often I can barely finish reading. It's like a traffic accident - you gotta look, and in my case, look and look and ...
I suppose everyone has a particular grammatical error that drives them around the bend (contractions and the possessive form are fun too) and mine has become homophones.
If anyone reading this is a teacher, perhaps you can offer me some insight (or incite for homophone lovers) into this recent epidemic of homophone horrors. Non-native English speakers/writers are exempt.
Then there are homonyms, which in some definitions are included in homophones and I can see their (there/they're) point.
Definition of homophone and homonym:
homophone - two words are homophones if they are pronounced the same way but differ in meaning or spelling or both (e.g. bare and bear)If I remember correctly I was taught homonyms were words spelled the same but with different meanings. But that was a long time ago, I may be misremembering.
homonym - two words are homonyms if they are pronounced or spelled the same way but have different meanings" Source
In case you are curious this site is a handy homophone reference.
Grammar is not one of my strong suits - proper punctuation and apostrophe usage have me second guessing myself and Googling as I write - and still I get it wrong. But homophones - I think I pretty much got that one aced.