Hm.
Okay, I do think that just leaving because Alex didn't immediately take some advice about GMing is a bit rude. You even said yourself he's new, so you should try to help work through things that are screwed up to hopefully improve his quality. After all, if you leave at an early problem, then the problem may be identified but future issues might not be. I cannot verify the claims of you letting Alex know about the Caliborn's destruction, nor can I say Alex's GMing is not in need of improvement. In fact, I think sometimes Alex does miss things like that.
I'm not going to hunt you around the site. I'm not going to try to avoid you whenever possible. All I am trying to do is figure out why you want to leave a new GM who has made a mistake in a poor position.