I'm 39 and did the same. I found myself annoyed by the repetition and humour that brought me back to being 9 years old, but also curious about where it would progress and what the underlying story might be revealed to be, if anything. Without the grating components stemming from being an old person, I'd probably like it or see the appeal better.

The humour is practically the raw embodiment of how little kids joke and play. If you're around little kids (especially boys often), you see skibidi toilet antics erupt from time to time whether they've seen it or not. Goofy facial expression, nonsensical voices and singing, over-exaggersted comical violence, constantly escalating battles, etc.