I don't like it, but I also don't dislike disregarding the caucus states.
Caucuses are exercises in voter suppression. That's what's being criticized, not the fact that they voted for Sanders.
And, of course, people only started complaining about them after he starting scoring massive victories there. Not a peep after Iowa and Nevada. Nothing suspicious about that.
Don't be disingenuous. People were complaining even back in 2008. And they sure as hell complained after this year's Iowa debacle.
I'm guessing that if Clinton won the caucus states by the same margins Sanders did, it would be Sanders supporters railing against caucuses, and Clinton supporters defending them while accusing Sanders supporters of brushing aside those states. I won't deny that there are inherent problems with caucuses, but disregarding the votes that were cast is hardly better than disregarding the Southern contests. Every vote and state should matter.