So wait, you endager his mother's reputation in his eyes and then you're butthurt that you're kicked?
-You were using an alias.
-You joked about his mother while he had no idea who you were.
-You did not make clear that you are an admin, how could've he knew? People don't type amx_who every 15 minutes.
You have no right to complain, and you had no right to say that to him, and in my opinion, you are the one who should be reported.
Post Scriptum: In the title, against is spelled without an apostrophe.