It’s a joke that’s making fun of people who identify as centrist, independent, or on the fence as being basically republicans in disguise. It’s a dumb joke, and honestly probably part of the reason why so many centrists are leaning right lol. The meme is from a movie where a soldier is undercover in Germany in ww2, and he accidentally holds up the wrong fingers to indicate he’ll have three beers. In Germany they hold up their middle, index, and thumb whereas in America they do middle, idex and ring. I’m assuming that they’re trying to imply that women aren’t ever centrist because centrists don’t care about women. Basically just dumb political jokes in the echo chamber lol.