Lemmys memes are alright if a bit too much pro-linus/bash-windows
Your chance to go against the flow!
Regardless of quality of each system, it's understandable that Lemmy's userbase would lean more towards Linux as the reasons for using both instead of the dominant alternative are similar. Also Linux works really well for most stuff you'd do on Windows compared to 20 years ago.
But yeah it becomes somewhat annoying when people base a part of their identity on it. Then again, this is always true, regardless of topic at hand.