Strawman: If I were a politician campaigning and were to say something like, "Veterans do not deserve benefits and I don't think we should fund veteran benefits" or "Veterans do not deserve our blind respect", am I now discriminating and will get banned from the platform?
My understanding dates to the 1990s but a covered company does not get to pick and choose what areas a protected class may be discriminated against. So, if a class is considered protected from labor discrimination you cannot discriminate against that class in any of your business areas (based on membership in that class. Basically: if someone is a member of a protected class, you cannot discriminate against them, you cannot foster discrimination against them by your employees, products, or services.
My personal opinion is that a candidate who said that veterans should lose benefits as part of their campaign would probably slide through this sort of prohibition, however if that politician called for some sort of action against veterans then they would get censored/banned/whatever.
Again, not a lawyer.