One way to fight the corporations is to stop worshipping at the altar of blind consumerism, and embrace the concept of “Reuse, Repair, Recycle.”
Stop buying stuff you dont need. Keep using what you have, sell/buy used items, repair things, and if it cant be fixed or repurposed, then recycle it.
Repairing things is a big one. Often repairs are remarkably easy. My wife has been ready to replace numerous appliances over the years, and I figured it was worth taking a shot at fixing it, if I can save a few hundred bucks, and successfully extended the life by years.
Very satisfying, and it forces your wife to rethink her conclusion that you are an incompetent dolt.
Generally, my tactic is to not engage directly, but address the rest of the audience, essentially pointing at the subject and mocking him (“Can you believe this MAGA Traitor?..”). When he tries to respond, again ignore him, and just point and laugh.
They get really frustrated being made fun of, without having the satisfaction of creating liberal outrage.