Ignore him, there are people who you can have discussion and debate and are worth the time and then there are ideologues, it requires an open mind and atleast some respect, he lacks on both. A bug when the lights come on at night will find the nearest crack, table leg to hid behind etc., there are those that just like the dark and nothing can be done until there is a change of heart. Feel free to flick the lights on him now and again but ... Proverbs 9:8
Have you thought of getting a walk in type freezer, there are a few places that will sell used ones or with some skills you can maybe make one, with all the restaurants etc. closing you may be able to get one for a fairly good price.
https://www.kijiji.ca/b-ontario/walk...b=true&dc=true
Make sure you have some kind of backup power with that much meat!