Still newcomers could get attracted with a bit friendliness visible in the wild?
I agree, but I also think newcomers get attracted to a place that doesn't treat people with reverence they do not deserve. I disagree on "good v bad dunks" because I think one larger post supported by a bunch of drive-by
does a lot of good, and it allows people to be more active posters, since they do not have to constantly lend effort to people unwilling to learn.
In my personal experience, heterodox opinions get met amicably here, as long as they themselves act amicable, though of course there's thousands of users on this site, so some will be... too much, too hostile or whatever.
If whatever I do is a terrible way to practice I'll have to concede, but I've yet to see to that.
I don't think it's bad practice, I think it's good you met the user where they were at and conversed with them. I just also think it was good that the user was met with mockery and derision. I think both can be good.