It sounds reasonable to me. If others are making groups based on characteristics opposing the dominant strand of the population but the dominant strand is not m

It sounds reasonable to me. If others are making groups based on characteristics opposing the dominant strand of the population but the dominant strand is not making any exclusionary group like the minorities are, then the minorities may have two places to belong (the total group everyone shares and their own in-group) while the dominant strand only has one group, with no in-group.