Why are you giving him a hard time? You are mocking someone that is trying to not contribute to spreading a virus in a pandemic (with someone immunocompromised in the house?) BTW get the vaccine asap if possible.Site your sources.
Never leaving your home is a bit extreme I admit, and could end up being unhealthy... not going to dentist, doctor in person, socializing safely outdoors, seeing people etc can mentally and physically be draining and potentially unhealthy long-term but as far as covid-19 transmission goes, he is helping you, me and everyone else around him.
People like him have sacrificed for all mankind over that last year or so while others certainly have not done their part.
Same goes for all the people that wear masks religiously, they are doing it to protect others (and to a lesser degree themselves).
Stop mocking people trying to help. Just say thank you for doing their part and move on...
My source is the CDC in case you were asking.