Seems it depends on which elite/establishment, going by Wikipedia’s definition: “populism” is the political stance of “the people” against “the elite/establishment”
So by that defn, both of these examples qualify:
- The people being distrustful of the establishment of medical science
- The people condemning the unfair practices of a monopolistic/oligopolistic establishment
Call their bluff!
If they’re SO concerned and want help signing bans for imaginary problems into law, there are plenty of real issues worth trading for in exchange.
E.g. from now on, schools nationwide are additionally funded to both prohibit litterboxes for students that identify as cats and provide free and healthy school lunches.