There are other people around you who probably don't think they're fun. Hot tip: the other people you see out and about are real, thinking humans just like you who have their own thoughts and emotions and world views.
You should consider how your actions impact others.
My subwoofer makes a huge difference for me inside the car without being loud enough for you to hear it. They give a nice rounded tone to the music. As with literally everything, don't hate the people that like the sound of subwoofers - hate the people that abuse them.
I am aware, that’s why I don’t have one in my flat (and I don’t own a car for that matter so none there either) but they’re still a hell of a lot of fun.