They do this to my brothers (ENTP & INTP) as well. They would go on and on about how they should be their own people, how they should be individuals and stand up for themselves in the face of everyone else's values (and this would literally come in the form of a lecture). But now that my brothers are teenagers, and one has decided to grow his hair out longer for style while the other has let his grow unruly for lack of caring, my parents harp on them all the time to get it cut. They've even threatened to cut it themselves. In all fairness, though, this pressure comes more from my ISFJ dad than my ISTJ mom...which I think may reflect more of a homophobic tendency than a type related difference.