No, they don't. Interestingly enough, one of the Sims that likes Kids music also has the Technophobic trait, which you would think would keep them away from the stereos.
Edit: So, I decided to test this out. I got a Sim out of CAS, set her favorite music as Kids, filled the house with stereos, and waited. It's not even noon in game, and she's already turned on 7 of the 14 stereos in the house. There's definitely something wrong here.
Edit 2: By 3 PM, all the stereos are on. And she wasn't even waiting in between turning on each stereo. She would finish turning one stereo on, and almost instantly queue up an action to turn on the next. When I tried to turn one of the stereos off, she turned it back on again.