The main legitimate reason I can see to objecting is not wanting to encourage "obnoxious bad actors". Renaming master/slave to something clearer and less likely to have awkward misunderstandings akin to "forking a child and killing widows and orphans" is a good goal in itself if it improves communication clarity. Toxic drama vectors get cut out for a reason - because nobody wants to deal with them.

Ironically it is possible both that someone is "right" on an issue and someone who is better off not encouraged. Contrary to what some believe there are bad tactics regardless of target.