What? Not that there is no one with this view but it is an extreme minority. Same with people calling for the killing of all cops on the left, very small minority.
Just look at the recent supreme court ruling that made it illegal to fire people based on you being gay or transgendered. Tons of conservatives shot back on that one. I don't know how you can look at a viewpoint like, "yes, employers should be allowed to fire you for merely being gay" and think that that doesn't mean they want to keep marginalised people marginalised.
1 - https://www.pewforum.org/fact-sheet/changing-attitudes-on-ga...
As far as I can tell, there are no politicians or indeed anyone with significant power calling for the killing of all cops.
Unless Nancy Pelosi or someone starts retweeting videos demanding the liquidation of the kulak class, you'll forgive me if I don't take your claims of 'extreme minority on both sides' all that seriously.
"People should be marginalised, and made second class citizens, and marginalised people should be kept marginalised" is a pretty common theme on the far right. It is rare on the far left; not that it's non-existent, but there just aren't that many sincere Stalinists or similar left.
What dehumanising content are you seeing from the left? I mean, if it's just "the other side are bad people" stuff, well, everyone does that. The "these classes of people should be socially and politically suppressed" stuff is overwhelmingly from one side, though.