AITA for wanting my sister to change the shower setting when she gets out?

This morning, after 2+ months of morning showers that start out on the jet setting and having to switch it back to the rain, I asked my sister why she uses the jet setting to take a shower. She said she doesn't, she uses the rain to shower but she uses jet at the end, when she turns the temperature to cold to wash her face, because she doesn't want the cold water hitting her whole body. I told her she should start switching it back to rain when she got out of the shower, just to be considerate to the people (two of us,) who use the shower after her. She said why should she, when, hypothetically, if she did use the jet for the entire shower, I never flip it back to jet when I'm done with rain for her. I said that didn't make sense. Number one, majority rules. If two of us use rain and one uses jet, rain should be the default. Number two, she'd just admitted to using the rain, so my flipping it off of jet is actually doing her the favor. She said that's not the point, and that it didn't take very much energy for me to switch it anyway. It doesn't, but it's annoying as hell to reach up and twist the shower head and have the cool water being pushed out go down your arm. I told her I hadn't said anything for awhile, but it was getting old, and I compared it to someone leaving the toilet seat up. It's fine the first few times, but when it keeps happening you're going to bring it up. She maintains that if it was me using the jet setting, I wouldn't change it back either. I maintain that that's irrelevant, because I don't use it. It's a stupid argument, I know, and we were both irritable, but it is annoying. AMITA for wanting her to flip it back?