I would re-ignore the alts or just re-ban them. I joked about it before, but the problem with spamming all of the mods all the time or spamming shit in general, the mods aren't going to miss you if you get banned. They're not going to make an argument for you to come back and stuff.
I've been very kind to him all things considered, just because I could be harsh with the banning and enforcing it. But I have no reason to. Being annoying is not a "serious" enough crime for me. But I will put him into time out sometimes just because he needs it.
I can ignore users but I choose not to because I want users to be able to contact me if something is wrong. So even the users that piss me off I try not to ignore.