Biden was hated so much that large groups of people chanted "Let's go Brandon" (fuck Joe Biden) in public. There is video evidence of this.

No Democrat politician has ever stated that Republicans have a mental illness for hating Joe Biden. Nor have they come up with a phrase similar to Trump Derangement Syndrome to describe it.

This is why I don't like "both sides" people. Overall Republican voters and their representatives are worse people.