Judgement is man's ugliest side
People need to realize that this world is consisted of individuals with different sets of values and beliefs. Even two biological siblings raised in the same household for their entire lives can share opposing views on certain matters. The same law is applied to interest and passion.
Just because a person likes to have her hair straight instead of bouffant and curly doesn't mean she is "crazy, weird" and "an outcast" or "trying to show off and be unique". Just because a person wants to work in a mathematics-focused field despite being pretty slow at math doesn't mean she is destined to fail. Just because a person refuses to wear push-up bras and would prefer a comfortable bra does not mean she is never going to strike a date.
When that person openly expresses disagreements toward her parents for forcing her to change, she should not be silenced and called "disrespectful", of course, as long as she is not actually being disrespectful in her words and actions.
Maybe it is up to both sides to open up their minds and understand that we (humans) are simply different and most of the time, the differences are not wrong. They are, in fact, the representation of the various experience we went through with our own, separate lives.
Yes, the person above is me (how surprising...). Under the age of 20, I haven't fully seen the world as it is. So, it might be true that I will look prettier with curly hair, larger breasts and have it easier with a legal job in the govt. But once again, am I really wrong for being the way that I am? NO! I like my hair straight because I can study without my hair getting all over the place, in my mouth, in my eyes, everywhere! Even though I cannot solve mathematical issues fast enough, I don't mind solving them for hours on end and I recently learn that I am rather detail-oriented and patient. The door is not closed on me! I absolutely love my "flat boobs" and how they make me look fine (like wine) in almost all outfits. One of my favorite celebrities is Keira Knightly who looks gorgeous just the way she is naturally.
Let's face it. We all hate disagreements. We intentionally and/or unintentionally ridicule behaviors and beliefs that are contradicting from ours while befriending and giving love to those with similar course of action and virtues. However, it is exactly this common and inevitable aspect of human cognition that derides us from many great relationships and hurts the people around us, making them feel insecure about themselves.
To be fair, judgement can hardly disappear since it is so deeply rooted in our conscience. It can only fade as you learn to become more empathetic and open-minded. Thus, before executing that judgement when you walk past a person with tattoos or work with a colleague in mid 30's but still hasn't got married, try to remind yourself that people are different and there is nothing wrong with that.
Note: I'm not saying that we should accept every single thing about others. Above, I stated that "most of the time, the differences are not wrong". The differences I was talking about are harmless and do not result in negative consequences. If a person is smoking, it is harmful to their health. If someone is habitually late for work, he or she is violating the company's policy and at stake of getting sacked. These are a few examples of cases where we should take actions and help people mend their ways instead of being a bystander.