The closest I've come to finding anything of Biden calling Trump a racist is this...
https://twitter.com/joebiden/status/1223727977361338370?lang=en
And this...
https://twitter.com/joebiden/status/1240361258957897728?lang=en
I don't think Biden was specifically saying it was racist to do a China travel ban, so much as just calling Trump a xenophobe in general. If he was saying the travel ban was racist then, yeah foot in mouth. Yum.
As for Pelosi, she was promoting tourism and Chinese New Year on a local station....
Trump took her words out of context and falsely claimed she deleted this clip from her Twitter, she didn't.
https://twitter.com/realDonaldTrump/status/1250852583318736896
In short, Trump claiming people are calling him racist for the China travel ban is him expecting his top political opponents to be their usual contrarian selves to all his positions. They aren't. At least, not on this issue.