Should I care if my 26 year old boyfriend wears tighty whities?

I know it shouldn't matter but i feel like they are undies meant for only kids and senior citizens. I can't help it I feel they make him look immature and like he is wearing a diaper. I have bought him boxers and boxer briefs but he says they are uncomftorable and can't get use to them as he has worn tighty whities all his life.
Should I care if my 26 year old boyfriend wears tighty whities?
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