100%–I was very closely paraphrasing the referenced poll with my “obnoxious” example. Here’s the offending post:
I don’t think so: there, “imbecile” is used to reference the singer, who clearly isn’t someone with a mental impairment, and it’s used in the sense of “fool.” If you say someone’s acting like a fool, you’re not referencing someone with a developmental disability.
That lyric is much closer to “That politician’s an imbecile,” only it’s even less cutting.