I don't know what men in general like. When I had a bob haircut, and either platinum blonde or dyed red hair, I'd often get compliments on it from men. More when I had super long (blonde) hair, though. Although those compliments were more along the lines of entitled harassment and assumptions of sexual availability. Now that I have very short hair of a strange colour, (bright purple right now) I mostly get compliments on the colour. Sometimes just “I like your hair.” Both from men and women, and lots of kids, who loudly point out my hair to their parents.