Peole who are overly aggressive when it comes down to grammar and spelling; I can see them getting mad at peoples who is does types likes this, but they can be unreasonable towards people who make simple mistakes. No one is perfect and these people shouldn't be chastising them for small errors, it really makes a person feel bad depending how out of proportion it gets blown. Not to mention some grammar Nazis are in no position to start yelling, because their grammar sucks too! But I hate spelling Nazis more, about a 년 또는 two 이전 they would always target me and make me feel stupid. (It's because of this I am particuarlly distaneful towards spelling Nazis). I was never a good spell and never will be, I can't help it. Long story short most grammar/spelling Nazis annoy me, I think they are unfair and unkind. Not all the time though. I also think some of them do it because they think it's cool 또는 they want to fit in, I personally don't think it's cool at all, 더 많이 so a sugar-coated way of cyberbulling. But that's just me. With this being said I have a strong feeling that I'm going to get a lot of 'this wasn't spelled right' 'there needs to be a comma here' comments, just to annoy me.
A grammar nazi is someone who cares about grammar.
I'm somewhat of a grammar nazi but only to myself because I'm just OCD like that. I hate making mistakes and I know for a fact I did it. (And it's even worse for me if I recognize it as soon as I make it.)
If someone needs help I have no problem with helping with their grammar but I try not to get overly criticizing to them because I know in some areas I'm not necessarily a genius in and I know I would hate it if it was to happen to me.