Fascinating. I'm sure you're not lying and that this is true from your perspective. And yet my experience is the exact opposite. If the "divergent ideas" are e.g. "everyone who voted for Trump is an evil nazi" vs "everyone who voted for Trump is just stupid", I'll grant that those two ideas will be entertained and debated. But if the idea falls anywhere outside the accepted orthodoxy, for instance "maybe people who voted for Trump were well informed and had good reason to do so", that idea is not tolerated at all.
Granted I live in Seattle, which is probably home to a disproportionate number of more extreme progressives.