SNIPER VIEWGIBBING AND GT ADMIN ABUSE?! SOMEONE ALERT THE PRESSES!!1!
In other words, this is old news. This behavior is neither appropriate nor acceptable, but there's nothing that can be done. GT happens to have some of the worst admin behavior around, or at least the most frequent bad behavior. Just stay away from their servers. The PaintCentral servers are a great alternative if you ping well to them.
Oh, and second: if you get kicked, stay out. You may think that the kick was unjustified, but you are not the admin. Kicks mean "Get out!". Rejoining after a kick will only get you banned, and at that point you have nothing to complain about.