Also, using the correct word isn't really a grammar issue. It may have been a typo but since you seem bent on defending the mistake, I can only assume you'd prefer not to care about correct word usage
So when you use bad grammar it isn't a problem because the point is to reply to the topic, not comment on grammar. But when I type the wrong word, the only issue is the wrong word.
I wouldn't have had an issue with your correction at all if you had also addressed the topic.
Off topic corrections is something bots do, not people.