Nope, they were just trying to be right over a trivial spelling mistake on the internet. People that do that are the same people that others avoid at dinner parties.

I get that most spelling corrections on internet discussion boards are like that, but I don't think that's the case here.

It was a substantive error in the use of a whole word/phrase, and the commenter was trying to do you a favour by relieving you from that misconception for the future.