Grew up in the Maritimes in Canada and that sort of culture was there for me, too. I definitely had some bad alcohol habits in my early to mid 20s. At one point, I could go through a 1.5 litre of wine solo, no problem.
I’ve dried out somewhat. Still a few drinks a week, but moderation is good (and cheaper)
Re: shitposts, it definitely strongly depends on who you follow. My home feed on mastodon is inundated with shitposts (and I like each one)