Bigotry against people who align themselves with a political ideology isn't the same as bigotry against people who are born a certain way such as their race, their sex, or their sexual orientation, imo. I can take the trump/biden sticker off of my bumper, but I can't take my skin color off.
But several of protected status groups can change,
some even voluntarily. Thinking of housing laws....
Age - Guaranteed to change.
Sex - Changes sometimes.
Family - Typically changes.
Religion - Changes as easily as political affiliation.
Disability - A change imposed upon one.
Source of income - Often changes
Education affiliation - A changeable status, but not protected everywhere.