It's so easy to meme the left because they are walking parodies of themselves. They, completely unintentionally, make total fools of themselves and have 0 self-awareness to realize it. It's easy to laugh at them and make fun of how absurd they are, so it's easy to meme them.

Leftists are so consumed by hate and anger that their memes end up either just sad and pathetic or funny for the wrong reasons. When we make memes it's because we laugh at something they did, when they make memes they do it out of anger and spite, and memes created from negative emotions like that just don't work.