We talking about Mauricio Garcia here right. The mexican minority and shooter?
He clearly is pro nazi yea... not sure i heard a mexican refered to as white supremacist before though, seems nazi is a more accurate term since he isnt white?
White supremacist just means you believe the interests of Whites should be supreme above all others, which means a non-White who is self hating enough could actually be a White supremacist.
It usually involves them having some form of severe mental illness though.