Do I have any case for reverse discrimination?

This would not be reverse discrimination.  Reverse discrimination only applies with respect to certain affirmative action claims.  This is discrimination based on sex which is prohibited by Title VII of the Civil Rights Act of 1964. Title VII applies equally to men and women.  However, discrimination protections primarily extend to "adverse actions" which means an action that immediately, negatively impacts your pay.  A reprimand, warning, bad evaluation, etc. are not generally considered adverse actions.  Clearly a termination would be an adverse action.