Do you care that in this context the meaning of master is "an original from which copies can be made" or is it irrelevant as you want to have bit of rightous rage?
> Whether this is intentionally "bad" holds no meaning whatsoever.
His emphasis is on empathy for the people who are affected by the usage of certain terminology. If it's a trivial change we can make to accommodate them, why shouldn't we?
You use he in "He said", should you not be more careful about your gender assumptions? Are you sure they won't take offense?
2) Even if I make a mistake, I think it's fine to apologize, say I didn't realize (and not repeat it with that person), and move on.
It doesn't have to cripple me into not being able to speak... we're all reasonable people.