The meme is about Jimmy Carter running as a candidate for election… The conversation is clearly about an election in which we are comparing candidates for an election.

This isn’t “Joe Biden makes a goddamn awful margarita.”, in which “Well putin makes a worse one” would be a whataboutism, this is “Joe Biden is too old to run as a candidate in the election”. And in an election, you compare candidates, which is not a logical fallacy.

Common accusations include double standards, and hypocrisy, but it can also be used to relativize criticism of one’s own viewpoints or behaviors. (A: “Long-term unemployment often means poverty in Germany.” B: “And what about the starving in Africa and Asia?”).

Might as well quote the relevant section.

Well would you look at that, there it is laying out exactly what I said. Deflection of an argument by accusing someone else of the same thing.

Stating that you’re voting for Biden because Trump is a Fascist wannabe dictator is not a whataboutism.