To be honest, I thought the toilet paper was some kind of scarf. I was distracted from what you were saying by trying to figure out what kind of scarf extra long handkerchief that was. I thought you were making a fashion statement. I think in person it would be much easier to notice that the material was much too thin to be a scarf. Even so, I probably wouldn't have done anything about it other than the indirect methods you mentioned, especially if it were in a lecture hall. I might have discreetly pointed at it.