Avoid master/slave terminology

Next will be male/female (in the context of wires, plugs, sockets etc) and it will be on a "spectrum of gender fluidity".

Political correctness/SJWism has gone insane and cannot be taken seriously.

Those namings relate to male/female sexes, not genders, so thats not applicable here. And even if it was applicable, if the name is steeped in a context that is oppressive to certain groups and there is a viable alternate name, what's the harm in exploring those alternatives and making conversations comfortable for everyone who might be involved?