It was not the first time I got that response. I genuinely don't know where people get this from?!
it’s important to not mock those ridiculous questions
Totally! It might be the first time a person gets to think about the matter in a deeper way. It is normal for them to be all over the place.
I think my answer at that time was something along the lines of:
It's true that these wild animals need to do that. But you are not a wild animal. You are an intelligent human, that has anything they could ever think of in the supermarket right around the corner. While a lion might not have another choice in order to survive, we as humans are not not in the same position. We can choose to eat something different while still enjoying our food and live a happy healthy life. So would it still be right for us to kill other sentient beings, if we are not forced to do so?
I normally think of my discussion partners as intelligent people that are able to reason. I won't let them off the hook easily, but there is no reason to "fight" with them as this will improve exactly nothing.
It is. But in the mind of these people, this is a valid concern and we need to be able to lead them away from this mindset. We have to guide them to new insights, not fight them over it. (Not that I would imply that YOU were trying to fight.)