This one is difficult.... Like I am way too good at introspection to ever come up with something I can't explain, nor am I very good at judging what a stranger would consider "odd". Pretty much every single one of my special interests would probably qualify. I play games basically nobody else plays.

I suppose my extremely weird idiosyncrasies around programming languages is the best fit for your question. Humans generally have like, preferences or favorite languages, whereas I am closer to the "you should be open to using whatever language gets the job done" end of the spectrum. However, where it gets weird is that I have a few hard limits that I absolutely refuse to ever compromise on with regards to languages, and while I can explain all of them, nobody would take it seriously or respect it anyway, so I never do. Worst of all, the most widely used and popular language of all, Python, violates these limits of mine the most, by a very wide margin. So most people are like "I only wanna use Python!" and meanwhile I'm just "I am happy to use literally anything other than Python!" and yet I'm the thing that gets screwed here because Python is everywhere >:<