No, I just understand that there are plateaus that you can't pass if you refuse to look presentable, and that it's a lot easier to present an image of respectability that people outside your field can see than to try to explain to people who don't understand what you do why they should trust you. People who don't understand your field need a way to judge you, and time spent forming a judgement is a risk; if you turn out to be of no use to them, that time was wasted. So, if you make it harder for them than it needs to be, they may just decide not to bother.
Making your professional life harder for yourself over something so insignificant in the grand scheme of things is really kind of childish. I used to rebel against people who wanted me to cut my hair when I was in high school too, but eventually most people accumulate enough substance as human beings to set aside these childish attempts to assert their individuation.