I am doing nothing of the sort. In fact, I agree with you when it comes to D&D morality.
You're preaching to the choir. I agree that predators are not inherently evil. I agree that great apes are not human. But fantasy goblins, as typically presented, aren't like dragons or gorillas: they don't have drastic physiology differences, and they don't fill a different role in the ecology/food chain. They are slightly shorter, colored green/yellow, they speak a different language, and they worship a different god. They are quite simply "funny looking humans".
This sounds like a very compelling approach to the subject, but it essentially proves my point. In order to make these goblins an objective threat with no elaboration required, it has to mutate them with magical radiation. Regardless of this youtube channel's portrayal, you have to admit that goblins are not by and large portrayed with that degree of "difference."
I've taken your other statements with a pretty light heart, and I hope my tone has been conversational and easygoing thus far. However, I'm going to come out very strongly against this point.
The things we say and write matter. Don't tell me propaganda doesn't affect the culture it pervades. Don't tell me that decades of sexist jokes haven't affected how men treat women, and how women treat themselves. Don't tell me that prejudiced attitudes can't fester and worsen when the people in power support (either intentionally or subconsciously) certain narratives while discouraging (either intentionally or subconsciously) others.
It's unfair to characterize this with the same brush as overreactions to heavy metal and video games. The things we say and write will almost never inspire someone to go out and Do A Murder. But they will inform our attitudes, our opinions, and whether or not we look at the person who's a different gender/race/culture and see a fellow human with differences or an Other to be (subconsciously) opposed, distrusted, exploited, or disregarded.