The Washington Post article given below as evidence that he is sleazy says this:
"Biden is a creature of his time; that's not so much an excuse as it is context. He is folksy and always (overly) familiar, the kind of guy who name-checks somebody named "Mouse" at an NAACP convention.
Those personality quirks have typically been viewed as part of his charm and political strength. But the recent display does, as York and others suggest, raise the specter of sexism.
....... He is given a pass because he is from a different time. There are plenty of older male politicians whose frame of reference in greeting the opposite gender is far too 1960s rather than 2010s; almost none of them are on-camera nearly as much as Biden is.
But as a man who prides himself on his work on women's issues, Biden might heed his own advice. He said that attitudes are changing about what "constitutes appropriate behavior." That should probably apply to Joe Biden's interactions with women too."
I agree with this completely. It’s not sleazy as such, it’s sexist and old fashioned and not at all unexpected in a man of his age and position.
I very much hope that the next generations will behave very differently, but I don’t think he is a predator.