Aren't their anti discrimination laws which should prevent such very obvious discrimination against some cultures??
The authorities response between the black live matter protests and the terrorism from trump supporters is just one recent example of this. As long as the people discriminating have more power than the ones being discriminated, laws only protect some.
I think the reason why we see these things still happen is because the laws are broad, continually improving, and education is administrated at a local level so you have different organizations rediscovering the same social issues over and over.