Its always money. Sounds like youre doing your best, hope he can see eventually whats going on.

As an anecdote, which I wouldnt necessarily recommend following: my father was pretty staunchly against meat substitutes in general. Well it turns out one of his favorite meals, lasgna, my mom had replaced the beef with soy-sub like 10 years ago lol. Dude loves it, she finally got tired of his comments and told him while he had a big mouthful. Hasnt said anything since and now he will eat tofu etc. I dont really endorse deception but it seems to have worked in this case lol