I just showed this to a Black person and they said it was regarded, whatever that means.

More seriously. Is "moronic" okay? It's just an ever so slightly more archaiac way to say retarded. The meaning, the negative connotation, the level of offense—it's synonymous and analogous across the board in its time.

Is it okay because "nobody means it like that, they're just using it as a synonym for stupid?" If so, congratulations, you now understand the other side of the argument better than when you started.