I prefer brushing my teeth in the kitchen
After learning about poop particles floating around bathrooms (even if you close the toilet seat) I don't leave my toothbrush in the same room anymore.
And the idea of cleaning my mouth in the same space that I poop & clean my ass has become nasty to me. I'd rather clean my mouth in the same space I clean my dishes and just spit directly into the drain. I also clean my kitchen sink frequently to reduce any residue.
I'm not calling anyone gross who prefers to brush their teeth and leave their tooth brush in the bathroom, so please don't feel personally attacked.