"I’ve written about the plague of UBM on our industry previously" wow the guy really hates Bob Martin, maybe it's a good thing to keep in mind that Bob is just a guy, he's not a prophet or a god, he doesn't know everything about everything ... you don't have to do or believe everything that Bob does or says or anyone else for that matter. But also Bob is entitled to his opinion, and I think he can tweet his opinions without being called elitist or anything alike because otherwise if we started name calling people with opinions, we're in deep deep shit!

PS: you can substitute Bob with any other name