Watching anime is like any other form of consumption. If you absolutely love chocolate, but hate coconut, would you eat an Almond Joy? No, you wouldn't. You would go and eat any of the hundreds of other kinds of chocolate candies that don't include coconut.
Similarly, if you don't like the look of an anime, why would you subject yourself to the punishing experience of watching it? Granted, the music might be great and the story fabulous, but that doesn't help if the aesthetic doesn't agree with you. Is it slightly frivolous to judge an anime based on its look? Maybe, but you have to remember that the shortest anime will probably see you watching 12-13 23-25 minute episodes of this to complete it. You have to remember that the aesthetic is the first thing and, most likely, the last thing you see in the anime. If a person can't stomach to look at it, does it really matter whether the music is good or the story is phenomenal?
Also remember that there are a lot of different anime out there. While they are pushing themselves to complete something that they would prefer to soon after blot out in a haze of drink, they could be watching something that they would actually enjoy and possibly discuss with others.
I think there is also a distinction here in what you are looking for and what they are looking for. When you are watching anime, the visuals are incredibly important. When you are discussing it with your friends though, comments on aesthetic are fewer and less important, as you can't actually visualize it without seeing it. The comments usually boil down to a simple "It was pretty." or "It was not pretty." Story, characters, and music take priority in discussions.
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