Assuming you are posing this concern in good faith, the answer is it is a very real issue that has everything to do with the platforms presenting meme based/photo based information. Virtually all major social media outlets sku heavily right and promote right leaning content well above similar content on the left. Its not that the left doesn't have this kind of content, it is that it isnt being shown as often by content providers.

If you find everything you are seeing is posts like the picture here, please recognize you may be a victim of propagandizing efforts and reconsider what platforms you explore.

Certainly here on lemmy, you can find many more short form/meme type messaging from the left/liberals than you can the right. It's a notable exception to the general trend