A New Way
One of the cons of living with someone else is having to put up with their way of doing things, particularly if they are different from yours. If it’s not handled well, this can lead to arguments and uncomfortable situations. When it comes to toilet paper, some people think that the paper should hang in the front while others argue that it should hang in the back.

We’re not sure which camp the OP belongs to but apparently, he informed his roomie that they were doing it “backwards.” Now, we’re not sure what this person was thinking and whether this was done out of spite or if they were really clueless but seriously?!