How do you stop shitposting?

Answer 1

Figure out why you're doing it to start with - what makes you want to add useless or offensive crap to a conversation? You should know it just makes you look dumb, right? And why would anyone want to look dumb? But there has to be some reason, so if you figure that out, you're halfway there.

Once you know why you're doing it, you can figure out a good way to stop. Instead of shitposting, find some other way to get whatever attention you think you're getting from that. You might try posting actual conversation that people will respond to positively. Or you might try posting a rant on your own blog instead. Or you might even figure out a totally different way to express yourself!