Constructive criticism is about finding something good and positive to soften the blow to the real critique of what really went on.
I'm not shy about heated debate or passionate discourse, but when people get crazy or rude, that's a buzz kill. There's got to be a better code of conduct, some basic etiquette.
When you're in the minority, it doesn't matter what you're agenda is, you're not going to have the degree of freedom that you have as a member of the majority.

