I do think there were some personal attacks involved in that one as well. Shaiman fans came down VERY hard on LaChiusa, and the backlash continued back and forth for months. Unfortunately it is part of the nature of this beast, posting about our loves and hates that sometimes people take it too far.
In this there are several considerations:
Schartz has ever right to hate whatever show he wants, and leave. (as long as it is not in the middle of a the act, which I would say deserves derision)
It is the case though that someone in his position is going to be held to a higher standard- his leaving the show "means" more than if I were to. He is making a statement, whether he means to or not. Especially if he mentions it to the press.
Personal attacks are out of bounds, translating something like this into a destruction of Schwartz in general is ridiculous. He has contributed greatly to the art form. His work conforms to his taste, and the taste of his fans, and just like everyone else he has great support and vicious detractors.
It seems perfectly acceptable though to debate why he may have left (yes it is speculation, as many things discussed here are) and to make personal judgements on whether someone in his position should do such a thing.
Doyle fans will defend the current Sweeney, and they should. It does not make them right and Schartz wrong.
I stand corrected, you are as vapid as they say.