Regardless of the reason(s) why the majority of Brits who voted to leave the EU did so, how does the desire to maintain one's society and culture, and not be overrun by socially and economically destabilizing and disruptive migrants in unlimited numbers, somehow automatically become "racism" in your mind?  At just what point would YOU declare unlimited immigration/migration to be just too much of a good thing?  To say that unlimited immigration/migration is not a valid societal and political concern, WITHOUT being racist in any way, is a specious and illogical argument.