The aesthetics of the water bottle is how the water is presented; I care only about the quality of my water (and that means if I focus on a good-looking bottle, then it takes energy away from where it matters; the quality of the water).
The issue is not that you don't care how the water is presented, it's that you purposefully try to make it look as unpresentable as possible. That difference between not caring vs trying to make it look bad is the difference between someone who is rough around the edges vs a rage bait troll.
If you want to stick with this analogy, ask yourself not whether the water is at even or even better quality, ask yourself whether you would trust the water enough to even check once you see that the person selling it to you went out of their way to make it look terrible.
People are not emotionless robots, they're not going to ignore the packaging because of some water quality test results. You have to get them to that latter point, the packaging is where that is accomplished.
I can already see you shaking your head, probably thinking this is all stupid, and that's exactly the problem. You think you're better than everyone else, and ultimately, that right there is the point. People do not need to be offended to recognize when someone is trying to rage bait them. And that effort you're obviously making tells people all they need to know about whether you are someone worth interacting with.