We can start with the fact that he was funding gain of function research in the Wuhan lab that released a virus that was the result of gain of function research. It killed millions. It was all over the news a few years back.
Then he proceeded to cover up his involvement with said gain of function research.
He's also a well known dog killer.
That's just the tip of the spear as to why he's an evil pig. (yes, just my opinion about what he is, but not what he's done... it's all documented)