Dude, I suspect you don't understand what racism is if you think that putting a "sarcastic" joke based on race in public, regardless of the source of that joke, is a good idea. That shit would get me fired if I posted it on a mailing list at work.
Remember one thing, your actions are the only thing that define who you are. Even if you don't think you are a racist, making racist jokes to try to be funny and attack Biden makes you seem racist. Saying something like that in response to someone accusing you of being racist makes you seem both tone-deaf and racist.
Fwiw, I'm not trying to insult you or argue. I'm giving you an external perspective based on your own interactions in this thread.