People are so out of it, it’s unbelievable.

Yes, he does care. Fetterman has developed a very recognizable brand with this outfit. He’s being consistent with his brand identity. Spectators might have missed him if it weren’t for the outfit. Instead of dissolving himself in the crowd as yet another no-name guy in a suit, Fetterman made himself the focus of attention by staying on brand.
This sweet, childish naiveté is actually quite upsetting to observe in adult people. I screenshotted one of a lineup of comments making the same clueless point.

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