Why I don't like a certain bathroom

I don't like using a certain toilet next to my bedroom. It has a lot of stains in the bowl. The stains are pink or a similar color. The cover of the toilet has yellow/brown stains on the bottom (of the bottom lid). It is often wet, and I think the liquid is urine. The toilet is also smaller than all the others and looks strange.

I almost always use the toilet in my parents' bedroom or the toilet downstairs because of that. I also sometimes use the toilet in the basement, but only when I am already in the basement. I don't like that toilet very much either, but I am fine with it.