If you are worried about this you might want to consider whether you have a healthy degree of concern about hygiene and bacteria. It could be worth speaking with a therapist.
I am not personally turned off by the hygiene of toilet paper rolls, but I think any rational adult's Overton Window should accommodate those who are. Your condescension is grossly unwarranted.
You don't have to be Adrian Monk to recognize that toilets are unsanitary.
If the bacteria on toilet rolls was an actual problem, toothbrushes would be a much bigger issue than storage tubs.