Did you hear about that group where only Trump supporters are allowed?

Did you hear about that group where only Trump supporters are allowed?
Everyone else is forbiden

This is a political joke, and also a pun. The humor in this joke requires the reader to recognize that forbiden is a misspelling of forbidden, and to also realize that it is also a misspelling of "for Biden" as in "In support of Biden".

Obviously this is in regards to the 2020 USA presidential election that is taking place right now. This joke also assumes that if you are not a Trump supporter right now you are in support of Biden (because he is the other person that has a good chance of winning the election.)

This joke wasn't that bad.