Well I can’t ban non-black people from wearing box braids but I wouldn’t recommend wearing protective hairstyles if you don’t have textured hair. It’s called a protective style for a reason. It was made to help kinky/textured hairstyles increase in length and also reduce dryness because if I were to have afro puffs, I’d need to braid it each night as my hair would lose moisture throughout the day. It’s not “just hair”.
No. Again, these hairstyles were created for a specific purpose and the “fashion” never includes the people who wore them originally or looks like the hairstyle’s creators. We can avoid treating them as fashion by giving credit and using models that look like the people that made them.
Absolutely not. Braids being linked to aggressiveness or being ghetto is extremely damaging to black women and girls. If you include the history, it’s basically saying “Hey! That hairdo you have to protect your hair and have done since forever is ratchet but when someone who looks different to you does it it’s fashion 
”
Give credit, know the history and be respectful 