I can be a rude prick online sometimes, but I can be in real life too - basically though the reason I do this is I never want it to be some huge surprise IRL if someone sees what I write online and be like, "wow, I didn't know that about him." I'm pretty much what I am online and IRL the same. For some reason this seems to matter for me, at least in the past when people have tried to like, send employers stuff I may have written online. The reaction is like "oh, yea, we knew that already about him."
Nothing terrible, maybe slightly embarrassing, but you know how online spaces can be. just be yourself basically, at least I try to be.