Sure it's a pro MK forum, but there's also a history here with bad mouthing other DS member's efforts and contributions - as long as one doesn't touch "the master" of course. I can't see the term "The Dullards" being particularly bad, it's just an opinion about the solo band being less exciting than DS.
As for MK and falling out with other members - you can EASILY treat people with respect and dignity even in the music industry. It's not like you can't get a message through without being disrespectful, if that's the case here. It's like in a soccer/football wardrobe. If someone makes a bad pass, you can give constructive criticism, or do the usual "macho boy" trash talk nonsense. It's a CHOICE, not a necessity.
We've probably all heard the "oh, I just play one instrument averagely" speech. You think he has had that attitude in the studio or the rehearsal room, especially in the DS days?
I'm pretty sure there would be less usage of terms like "the dullards" if people also would stop putting MK in a separate league compared to the others, and treat everyone as equals. That just means there is some sort of strange competition about being better than someone else at something. But, after all, when you put on a record, you do hear a band effort - not just MK.