Paul Graham published an essay recently which describes these kind of people as "aggressively conventionally-minded": http://paulgraham.com/conformism.html
Essentially there are some people who will follow rules and trends without questioning them. Among those there are some who will actively seek to punish those who do not follow the rules.
This master/slave thing is a new rule born out of guilt and virtue signalling. This comes from the fact that some people see themselves as genuinely superior to others and this makes them uncomfortable. They virtue signal in an attempt to fight against this feeling, rather than just accepting what may be true, moving on, and continuing to be a good person. It's a phenomenon that has been observed in many contexts. The most vocal homophobes are often homosexual themselves. The most vocal religious devotees often have the strongest doubts.
Essentially there are some people who will follow rules and trends without questioning them. Among those there are some who will actively seek to punish those who do not follow the rules.
This master/slave thing is a new rule born out of guilt and virtue signalling. This comes from the fact that some people see themselves as genuinely superior to others and this makes them uncomfortable. They virtue signal in an attempt to fight against this feeling, rather than just accepting what may be true, moving on, and continuing to be a good person. It's a phenomenon that has been observed in many contexts. The most vocal homophobes are often homosexual themselves. The most vocal religious devotees often have the strongest doubts.