Second of all, bigotry is not a disability because disability is at least partly an individual condition that can often be successfully mitigated w/individual interventions (mobility aid, medication, glasses, PT, therapy, etc.)
Bigotry is a group-level, socially learned process that isn't effectively changed by individual interventions (like therapy).
For effective intervention it requires group-level interventions (laws limiting discrim. behavior, social actions like shunning, mockery, etc.)