Is it rude of me to call my boyfriend out when he is being stupid?

I usually tell him he’s being stupid , that’s a stupid thing to say or do. And I seem to have to do it a lot because he has stupid opinions quite a lot. He claims it’s rude and mean to imply he’s stupid and that he doesn’t treat me that way. Well I don’t say stupid things so he doesn’t have to. Am I being too harsh or blunt?

Is it rude of me to call my boyfriend out when he is being stupid?
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