So if you live in apartments then a few years ago you were forced to switch to a low flow shower head.
They suck. A lot. You barely get any water out of them. It takes two or three times as long to take a simple freaking shower because there's so little water coming out. I've been stuck in apartments because of one thing after another, I replaced the low flow shower head but there's plenty of people who either can't do that or it doesn't occur to them.
Low Flow shower heads are a pretty major inconvenience and regular people's lives put forward by obnoxious centrist bureaucrats. It has very little impact on water savings but it looks good on paper. And of course it only applies to lower working class types, if you've got money you can buy fancy shower heads or even just playing a fancy shower with plenty of water flow. So it very quickly becomes a sore spot for a lot of people.
The same is true for when they took phosphates out of dish soap. Very little impact on the environment because they didn't do anything about the massive amount of phosphates manufacturing dumps into the water supply but a huge inconvenience for everyone involved. Since then my dishes have never really came out clean.
It's basically trump, or more likely his handlers, figuring out an issue that resonates with voters and hitting on it. And left wingers being dipshits can't see that. Most of them tend to be much better off because they graduated college and have better careers so they don't have to put up with these frustrating Little things.