I agree, but Sundial is the most destructive force so far.

While - to cite myself - being stupid is not a crime, we shouldn't go crazy and spend much more energy on fighting him, than he needs for provocation.

The regulars already know how to handle his "advice", it's only necessary to shortly warn others.

There are already enough analysis of his behaviour in the archives to link to.

Having said that ...

... he recently threatened to sue the monastery, personally I think this is indeed a reason to "uninvite" him from this party here.