If you mean here, it's not that people get offended when you correct their grammar, they just think it's ridiculous and laughable that you consider grammar a big deal on the internet. I can understand putting your foot down on a bunch of incoherently typing 12-year-olds but in ummmm and on this board is a whole different level.
Also "grammar nazi" is a common modern-day English figure of speech, get over it. And you are one.
(no hard feelings, of course).
Anyway...
1. What language is your native tongue, and were you lucky to be raised in a bilingual household?
Well, I was born in the states so I would say English, but I do live in a bilingual household because when I was two we moved to Israel for six years, so everyone in my family picked up Hebrew fast and are fluent. My dad was Israeli so there were few times we spoke Hebrew at home, but now we pretty much always speak English.
2. What other languages do you know other than your first language? If you care to explain, when and why did you learn them?
World languages? Just English and Hebrew. For those see above. Other "languages" I know include Pig Latin, Ubbi Dubbi, and Al Bhed (lol).
3. Which language do you use most frequently, and which language do you prefer the most?
I use English the most but I was just in Israel for a whole year last year so I kinda got back into using Hebrew as default.
4. What would you think of your vocabulary level? What is probably the most complex word you use on a daily basis?
I don't bother trying to impress people with big words.
5. How's your handwriting? Is it legible, or do you think it's too sloppy?
Shitty, only legible to myself.
6. Do you happen to be a Grammar Nazi? Or are you fairly lenient on the grammar of others?
I'm mostly lenient, but if you see above the only cases in which I would call someone on it would be if:
-They were an incoherent 12 year old that constantly talked like a prep.
-What they had actually has a funny different meaning than what they meant.
-They were a foriegner that actually said something comical like the kind of stuff you find on Engrish.com.