I think you learned the wrong trick. The "trick" is to not have a trick. Use mature, respectful language and not echo the divisive political language wielded by activists.
I think he tried to use mature, respectful language. But he apparently anyway put his foot in his mouth.
Of course everyone should do their best in being sensitive in their ways of expressing themselves. But many people could definitely show a little bit more generosity in their interpretations and not jump on every chance to interpret something like racism or sexism.
Exactly. There is no need to inject identity politics when you just need to tell someone that they need to make sure to take credit for their work. If you inject identity politics into a situation, you are taking a risk. Going into identity politics when there is no need to just comes across as someone being a vain moralist.