You could temporarily turn off the ignore during a game like that. And as some have noted, if his behavior is that bad, reporting should take care of it.

Unfortunately when you simply don't like a behavior and the moderators deem it legal, the onus is on you to ignore them or suffer through it. But, you do have the ability to object out loud to their behavior and ask them nicely to stop.

After that, you could put in a complaint to the host of the game, in that case Seamus Fermanagh, who would try to resolve the dispute in the fairest way, and he'd possibly ask the offender in question to tone it down too, even if it were legal.