My experience is different. As a social scientist, I've never seen hatred like leftist hatred. I'm exposed to the academic left, which is seething with hatred and intolerance. As far as the mainstream, non-academic left, boy they sure hate Trump – and anyone who supports him.

And before Trump, leftists already had a pretty intense hatred of Republicans/conservatives, and libertarians to the extent they know about them. America is extremely partisan, and the two major camps tend to strongly dislike each other, sometimes popping out as real hatred. Research shows that conservatives tend to know more about leftist positions than leftists know about conservative positions, so that suggests that leftists may be operating with more emotion and less information.

(And when I use the word "hate", I mean hate as defined in common dictionaries. The left has infamously co-opted the word to refer to any negative appraisal or feeling about a person or group of persons experienced or expressed by a non-lefist. I'm sticking to hate as extreme animus.)