I work, with one other woman in a building with dozens of men. I do know the cleaning crew though are all female as I see them occasionally at the end of the day. So it may be them...
Because of the lack of females I guess, we are expected to just put used tampons and towels in the bin in the cubicle, which I don't find problematic.
I was binning my tampon the other day and saw lots of used towels in the bin, unwrapped in toilet paper or anything, just lying there. There can only be one other person doing it and it irritates me as I find it disrespectful to the cleaners. It isn't hard to just fold your towel and wrap it surely?
YANBU to be irritated by female colleague who doesn't care less.
YABU who cares? It's just blood (which I also do get, it is just blood, so maybe I am being U).