The correct action was to NOT leave and call the school security- and see how they handled it.
If they had any sense they would have told the students they could not expel a person for ‘being white’
Be like President Trump! Stand up and and never give in to this sort of thuggery.
Over 50 years ago the State University I attended made part of the student union a ‘Black Student Union’. One day I sat down at a table on the outside edge of the BSU to check some assignment. Very quickly two large black guys who looked to be about 30 sat down and one leaned over and said “ This place is for black people. Get up, leave, don’t come back.” I did so. I paid attention and noticed these two goons were there every week day. Always sitting in the corner drinking coffee and exuding menace. The gossip was they were either drug pushing or were some ones muscle.