At 2.5 ... what suffering? It sounds more like he's using her as a way to say that he resents something, kwim?
At any rate, I plan to treat the pork issue the same like many parents do vegetarianism -- when our children are young, eating only what we directly provide, etc, no pork. Obviously. When our children are older, eating at friends houses, making choices about school lunches, hitting the mall, etc, I'll make sure they know our preferences and why our preferences are what they are, but otherwise I'll make it clear that their choices are their own and they're not going to be in huge trouble if someone tells me they were spotted eating pepperoni pizza.