I had (yes, past tense) friend who, seemingly, would flush at some point during every conversation I had with her. It creeped me out, and I said so, but it continued, until other behaviors added up to devalue the friendship, and I finally avoided here all together. My phone is not allowed in the bathroom. I grew up with phones attached to a cord that didn’t go there, so I know I can manage without one while I do my business.