I think you're a nicer person than I am, giving him the benefit of coping with his sobriety. I'm sure that the quality of your life does affect how you react to others, unless you're remain vigilent.Is it difficult to be around? Yes. Unfortunately, as a contestant in a reality tv show you are in close quarters and under a lot of pressure. It's done on purpose to produce drama. Still I find it a crock that Bert feels isolated because of age. I find at my workplace the ageists are the young folks not the older. I think it's more as a recovering alcoholic he controls his environment and in this case he cannot and he probably feels very vulnerable and lashes out at everyone.
I've been without my beloved cigarettes for almost 4 months now and I'd love to behave badly when the desire arises and I have to tough it out...... But I don't. Bert should have learned all this at his age but I'm afraid he's still a spoiled child.
Also regarding age, I don't have one friend who is older than me. My youngest friend is 22. Bert doesn't have to marry these fellow contestants but he needs to see them as just people, maybe lacking in experience or maturity and find commonalities for the time he's there.