Note
Let them acknowledge hypocrisy, don't give the answer
Do not call them a hypocrite from line one, and do not rush to label them. Ask step 3 clearly so they conclude that respect and exploitation cannot coexist. Sometimes we give them the answer too quickly instead of letting them say it.
Gives ammo
You're a hypocrite because you're not vegan.
Gives nothing
Can you truly respect other animals if you use them for your purposes?