Both sides are definitely full of it. I think one side is significantly fuller of it but I might just be full of it myself.
Analyzing my own behavior and thought patterns forced me to arrive at the following conclusion regarding my own biases: the issues I care about most tend to be issues championed by Democrats (with a few significant exceptions), so it was easy for me to fall into the trap of seeing Republicans as “worse” and buy into negative depictions of conservatives. If I were as passionate about the issues conservatives tend to be passionate about, I’d quite likely view progressives as “worse”.
Our bias and self-confidence convince us that what we believe is obviously the most reasonable belief, and anyone who disagrees must be missing something, when what’s usually missing is just a bit of perspective, and perspective is difficult to maintain when feelings are involved. And because politics involve people at every level, feelings are always involved.
True objectivity is hard.