A new angle to take with these people is to frame them as selfish and uncaring if they are married or in a relationship. Because to force the entire world into lockdown when THEY already have a love partner is a very different experience for anyone who is young and single. Don’t even let them challenge you on this. Use the same condescending attitude of “you cannot speak to this because you are not single, and therefore cannot even accurately conceptualize the problem because of your relationship privilege”. Then just keep pushing this angle. Point out how selfish they are to force single people into a life of isolation for years while they happily bang away on their spouse. Tell them they have a “I got mine, so fuck everyone else” attitude, and let them know how profoundly disgusting you find their lack of empathy for their fellow human beings who are deeply suffering.