Quoting you is demonizing you? You're the only person here who's called anyone a name.

Language is important. "Grunt work" is a phrase used to devalue jobs in order to justify low wages, regardless of how important those jobs are and what skills they actually require. If you want to use the phrase, don't expect to be immune from criticism. You weren't using it ironically or something, you were just straight calling it that.

And you're the one who asserted that "some people" can only do those jobs. Which people are that, exactly? Have a group in mind? Or was that just another careless use of language?

There is no such thing as 'unskilled' labor. That concept is part-and-parcel to that undervaluation of labor. Line cooks, construction workers, professional drivers, etc, all have skills that doing similar activities non-professionally does not impart. They all require training and experience.

The attitude that certain jobs are something "anyone can pick up and do just as well" as someone experienced in that work is just hubris.