This anecdote is irrelevant to the topic because you’re talking about merely cooking with different dietary preferences. Veganism is about respecting the lives, dignity, and autonomy of all animals, and therefore seeking to minimize harm done through personal actions and economic consumption. The only relation between the two topics is superficial. Carnism is absolutely a strain on relationships for vegans, and many would not consider partnering with people who gleefully consume the corpses of its victims.