Earlier quoted context omitted.
Your comment seems unnecessarily antagonistic. Given whatever size of garage I have, being somewhere I can live without a car gives me more garage space, regardless of whether it's a suburb. If I want to maximize garage space given my choice of a car-free lifestyle, I would probably move to a suburb with a good train station, not one where "only 20 minutes' drive to downtown" is seen as the selling point. Those are s…
Nah, I'm joking, hopefully not antagonizing. My point was that since you're not downtown, you can park in the street. Minutes to downtown isn't a selling point I'm making. I don't typically go downtown. I've put 10k miles on my car in 3 years. This was in response to someone saying they can't get exercise in a suburb, which I find absurd.
The antagonism is from effectively calling them immature (and thus implying that their opinion is coming from a place of naivety) and placing yourself above them. This is a pretty standard insult that people use to try to be persuasive.
I suppose you could say that posting that insult itself is so immature that readers should recognize it as a joke, but I suggest that you should try to stay away from sarcasm when posting in online forums. It can be quite difficult to detect the sarcasm of a bunch of people you don't know.
I could end my post by sarcastically saying "don't worry, you'll learn what a joke is when you grow up", but hopefully you can imagine how some people would take that as a genuine insult rather than a joke. Though it would be punchier ending.