Buddhist monks and nuns shave their heads and don the robes as a ceremonial act of letting go of identity views such as 'us and them' and even self and other.
This and not holding onto dogmatic views in general is a big part of the practice and the teachings.
Not saying all Buddhists are perfect by any means. I've hung out in enough Buddhist online spaces to come across a lot of dogmatism and people using Buddhism itself as an identity view. Myself included when I wasn't as far along my own path.
But the intention of the practice is to point these things out and help people to let them go. Not to cling to them.