Often the effect of being blinded is that you take suboptimal actions. As you pointed out in your example, if you see the problem then all sorts of cheap ways to reduce the harmful impact occur to you. So perhaps one way of getting to the issue could be to point at that: “I know you care about my feelings, and it wouldn’t have made this meeting any less effective to have had it more privately, so I’m surprised that you didn’t”?
Often the effect of being blinded is that you take suboptimal actions. As you pointed out in your example, if you see the problem then all sorts of cheap ways to reduce the harmful impact occur to you. So perhaps one way of getting to the issue could be to point at that: “I know you care about my feelings, and it wouldn’t have made this meeting any less effective to have had it more privately, so I’m surprised that you didn’t”?