Plenty of people start on acoustic. It doesn't teach bad habits in my opinion. Acoustic teaches the good habit of more precise fingering, because when you fret a chord slightly off it sounds worse on an acoustic vs an electric. At the end of the day it really doesn't matter much which one you learn on. For me acoustic wins because you can pick it up any time and start playing immediately. There's no fiddling with amps and cables, no power cords or batteries to worry about, and I can wander around the house to different rooms while playing if I want.