Not sure if you meant it this way, but the insight that I drew from your comment was: When we think that either A or B are not super important beliefs, or we a

Not sure if you meant it this way, but the insight that I drew from your comment was: When we think that either A or B are not super important beliefs, or we are observing from such a distance that the differences between A and B seem small, then we feel the people are narrow minded and prejudiced if they strongly hold on to their belief and are openly discriminatory against the other. However, when we personally and strongly think that one of the beliefs is completely evil or unacceptable, then we feel that the distinction is justified and that it's okay to not just oppose it, but also feel confident enough to do so openly and with pride. TLDR; It's much easier to be non-discriminatory if we (or our belief system) don't (doesn't) have any skin in the game.