Welcome, Grammar Geek! ( love the nickname; classmates of mine used to call me "Word Man" because I knew just about any word in the dictionary. I prefer "Word Nerd".)
Not everybody appreciates people like that so I have to be careful not to look like I'm showing off or being arrogant, but I am a stickler for correct spelling ! I have to all but sit on my hands to not correct the typos in library books (and to be totally honest, sometimes I do anyway...)
Note to Jeffrey who "is not good with spelling and grammar": Don't worry about it, I don't judge. And your spelling and grammar in the post look fine.
I used to have a real problem with correcting my teachers' grammar. Most of them did not appreciate it. Luckily, I'm now able to hold my tongue when I see the instructor make a spelling error, although I'm usually unable to concentrate until it's erased or fixed. But now I'm an editor for my college newspaper and a proofreader for the sermons of some wacko conservative preacher, so I get to correct people for money!