I promise you they’re not. Look at it with the roles reversed, would you be sitting there long after the shift thinking “Ha, that was so stupid, how could they not figure that out?” or would you have thought “huh” in the moment and moved on with your life? Maybe even felt some empathy for them.
Plus, they asked you, so they didn’t know either. There are some people who never grow up after school, but the vast majority of people are just living their life. The people who haven’t? We don’t care what they think.
For decades I’ve spent too much time here. The internet is not real life. With 8 billion people, it’s incredibly easy to find a few hundred assholes at a time, they tend to find each other online. You had maybe a dozen people around you total in the moment.
Besides, correcting grammar on the internet is basically a meme coming from the days of forums. Sometimes even then, people are genuinely just trying to help. It’s not that I’m being naive or trying to say most people are good people (though there’s an argument for that), but I’m saying most people don’t care enough about each other to think about something like this for more than a few minutes. The only new thing is that people keep recording shit now and posting it online, which sometimes goes viral. If that didn’t happen then you’re good.
Look at this post if you want to consider the internet, you have 38 upvotes and 2 downvotes and several people offering advice in the comments. MOST people just don’t really care enough to judge you for this.
I will concede that from what I’ve experienced jobs where you’re flipping burgers (McDonalds, Burger King, places like that) you can have a lot more young people working and it can sometimes feel like high school again, but it’s usually just their own drama.