Not the parent, but your characterization of the stated perspective reveals quite well that you aren’t taking it seriously! This is a complex issue, so let’s treat it that way.
The micro-aggression, as I understand it, is having to ask yourself whether the term ‘master’ _did_ originate from slavery (in the context of git, IIRC it didn’t, but master-slave replication is the stronger example). The context and plan fact is that programming, as a broad culture, to date, _has_ been excluding Black people and others. So it is not hard to imagine some folks desiring to make a symbolic change to make the culture more inclusive.
The micro-aggression, as I understand it, is having to ask yourself whether the term ‘master’ _did_ originate from slavery (in the context of git, IIRC it didn’t, but master-slave replication is the stronger example). The context and plan fact is that programming, as a broad culture, to date, _has_ been excluding Black people and others. So it is not hard to imagine some folks desiring to make a symbolic change to make the culture more inclusive.