I've never felt good calling myself a language nerd, since I only speak one language. But I can't call myself an English nerd because I'm not English. And I've been making a serious effort to not be a pedant because language changes over time and you can't stop it. For example, it grinds my gears when people say "less" when they mean "fewer," but I don't correct people, and I vow right now that I'm going to let that go forever. I'm fine with ending a sentence with a preposition, because the lengths you must go to in order to avoid it are never worth the effort. If someone corrects you on that, tell them to "shut up."
There are other grammar rules that are just not worth policing because popular usage is changing. I could not get my kids to say "different from" instead of "different than," and I would correct "on accident" in favor of "by accident." But why, then, is that different from saying "on purpose"? Yeah, some grammar rules should just go away- especially ones about the confusing use of English prepositions. If you can make yourself understood by the person you are addressing, that should be enough.
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