So, here are some of the memes I've made concerning social justice, as well as some of my favorites that were made by other people. They can be about racism, or sexism, or other issues. They can be completely serious, or they can employ humor (satirical or otherwise) to help make a point.
Memes I made
There's one I made to demonstrate the problems of "assimilation" versus multiculturalism (and to reference the fact that "colorblindness" is problematic). I had to search for a picture of the Borg (a group first introduced in Star Trek: The Next Generation), though I think the pic I ended up using might actually be of cosplayers. If so, I'm sorry about that, but it was the best Borg pic I could find.
There's one that takes a meme I saw on facebook, and I think the intended point of it was a sentiment that I disagree with, so I added some text to the bottom, to fix it by (I assume) turning its original meaning around.
There's one I made one day because of a disagreement I was having with my oldest friend. He was upset about my making the meme as a result of our conversation, and said something about how I could just unfriend him. Which I did. That was a really bad day for me. But I stand behind the meme.
There's another one I made by adding text to someone else's meme, this time to say that the problem isn't religion, it's the people preaching their religion incorrectly.
There's one about people complaining about increased diversity in entertainment.
Memes other people made
Note: I eventually broke this up into various categories. Of course there can be some overlap, so I just did the best I could to decide how to categorize each meme...
I don't really have things to say about all of these. But there's an amusing one based on Rudolph the Red-Nosed Reindeer. There's one about the Doctor Who episode "The Web of Fear." And another Doctor Who meme about the 13th Doctor (which also paraphrases a line about Elizabeth Warren). And one of my favorite memes from Wokémon (which has lots of good memes). And there's one with a quote by John Oliver from Last Week Tonight.