I'm surprised that Luce made such a vague statement. I think focused, well-publicized, measurable product boycotts can have an effect. Say, you could boycott 3 specific consumer products because their parent company advertises on Fox, and perhaps get them to pull ads. You don't want to boycott a car company or insurance company, because people buy those items infrequently, so the impact is impossible to measure.
Keurig is an obvious choice - SO MANY reasons to boycott Keurig!
HOWEVER, ironically, Sean Hannity's fanbase
already started a Keurig boycott in 2017 because Keurig pulled their ads from his show in the wake of a tsunami of negative feedback over his pro-Roy Moore rants. Damned if you do and damned if you don't!
One could call a boycott of Crest products, Ace Hardware (franchisees might force a quick reaction), and ... Viagra (Pfizer)!
[Haha, no, obviously can't boycott prescriptions drugs, since folks may actually NEED them. Altho in this case it's tempting because it would cause the patriarchy so much angst]
Sensodyne? (Glaxo)
It needs to be a short list of consumer products for which there are viable alternatives made by other companies. And it would need to be very well promoted.