Look from admins pov, you kicked someone, then got kicked off the server, then rejoined and insulted, him, you looked like a troll obviously.
Plus, admins are donating their time to help the people on the server, insulting them isn't going to help your cause at all. I have never banned someone for insulting me, however I have been pushed almost to that point buy people who just argue and insult me for the sake of it.