Or maybe getting people uncomfortable and forced to think about it, and actively face the dissonance is effective. Maybe they get mad and confrontational, but then you have to ask why.

Why are you doing something whose moral implications are making you uncomfortable?

Same thing goes for shit like buying stuff made by people in horrible working conditions. Maybe we shouldn't feel as if we are entitled to being comfortable all the time, especially when we do so at the expense of others. What if it was you in the place of the worker or animal? Are you okay with continuing on like this?

And it makes people uncomfortable because it makes them see themselves as a bad person. But hey, maybe you should feel uncomfortable if you are doing something you yourself consider bad.