Aside from the term "grammar Nazi" (because, ya know, correcting someones grammar is EXACTLY THE SAME as participating in genocide), I'm cool with being one. I'm not perfect. I make mistakes when I'm tired or distracted. I use the word "like" too much, I sometimes type in all-caps for emphasis. Sometimes I even put periods after sentence fragments (Also. For. Emphasis.). I am actually capable of letting similar mistakes go when I find them. Obvious typos, sentences ending in prepositions, I can handle not correcting these things, they've worked their way into common use with the Information Age (also, you're welcome for not using the word "vernacular" in this sentence). Improper use of "your/you're" and "their/there/they're" drive me batty, though. Similarly, correcting these things drives others batty, which leaves us at an impasse. Either I correct the grammar mistakes I see/hear and feel better or I don't and let others continue to feel alright.
To all those I correct, I'm really not trying to be a bitch. When I say something like, "Actually, this sentence requires the use of the word 'their' instead of 'there'," or, "Its spelled a-l-g-o-r-i-t-h-m," I'm not calling you out. I'm not trying to make you look or feel stupid. Even though these things come easily to me I understand that everyone has talents in different areas. Maybe you're a terrible speller, but algebra is a breeze for you. Maybe you can't tell where an comma goes, but you can run a marathon. Perhaps you are one of those people who capitalize random letters, but you're a fantastic cook.
My whole point here is that it's okay for you to embrace your strengths and it's okay for me to embrace mine. If you're a fantastic musician, mechanic or carpenter that's really awesome! I'm a good reader, a good speller and halfway decent with English grammar. That's my thing. And I'm okay with being good at it, and I'm okay with having a compulsion to correct mistakes.
I will leave you with two thoughts. The first is that I am always ready to learn something new. Feel free to correct me when I'm wrong. Really. <--- Including that sentence fragment right there. And the second thought is just a little bit of snark because, well, I wouldn't be me if I didn't include some.