Apparently there is now Brexism and Brexists, and employers are being advised to watch out for it in the workplace and in the recruitment process.
The following are dictionary definitions of racism and/or sexism. Just substitute Brexit.
1. The belief that one’s own race/gender/view about Brexit is superior to the other.
2. Antagonism directed against someone of a different race/gender/view about Brexit based on the belief that one’s own gender/race/view is superior.
3. Attitudes that foster stereotypes based on race/gender/a person’s view about Brexit.