I hate it when someone else's hair touches me.
What I mean here is, if I am standing on the train holding onto a rail on top of a seat and the seated person constantly flips her hair so it touches my hand. Or if I am at a sporting event or movie - or any other place with stadium seating - and the person sitting in front of me whisks her hair so that it touches my knees. These people are more than likely unaware that they are intruding on my personal space, but even so I don't like the feeling.
By and large, I am not really a fan of long hair anyway. Long hair seems like it holds dirt. It certainly collects more of it. And when someone with long hair decides not to wash it, and just pull it back into a ponytail or bun, they are just admitting to the world that their hair is dirty and so, by association, is the rest of them.
I don't have animosity about hair. I actually like that I am bald - or balding. I embraced it years ago and actually look better without hair than I did with it. It certainly makes life - and my morning routine - alot easier.
I also don't like it when someone sitting in front of me constantly brushes, combs or runs her fingers through her hair so that strays fly out and land on me. It's gross. Next time it happens, I will collect the strays and hand them back to her, saying something like, "Here, you dropped these" or perhaps, "Wow, you just lost alot of hair - have you heard of alopecia?"