He’s basically a poorly trained dog who will hump just about everything in sight, including a table or a chair. This kind of behavior is irritating for men. Many women find it threatening. There are also photos of him doing it to children.
In any event, Biden is a right-wing shithead who should have been flushed out of American politics a long time ago, not only for his atrocious behavior towards Anita Hill, but for his pro-segregation views in the 1970s, and for his anti-abortion views in the 1980s. If the Democratic Party nominates him in 2020, I’ll vote for Jill Stein.
And I shouldn’t have insulted poorly trained dogs.