I once got banned for explaining what anti furry means to someone (who was not a furry btw)(and there were no furrys in the server so nobody got offended and yet I still get banned)
I'm pretty sure in settings, theres a "Log out on all sessions" button. Just press it, log back in as quick as you can, and change your password as quickly as you can. If the hacker is quick enough, this won't work, however.