Dark skin tones, how coooool (and long overdue in manga!) And what charming people they are. Also quite pleased how the meeting went. Since it's playing in an ancient setting with ancient belief systems it is somewhat accurate. Even if wholesome us may feel uncomfortable over the notion. It is still technically correct that humans can get surprised over new encounters. And let's not forget that just a bit before a huge cute daddy lived through the same thing due to having an outer appearance that partially is very opposite to his inner workings. And it easily put attention to how even people who went through discrimination aren't safe from how our brains work. In "shelves". Since it's easier to make swift judgements in everyday life by making incoming information better processable.
The confrontation with anything unknown can trip us and that is totally normal and alright. The question is always in what we make of everything once we're past the first surprise(s). And what we make of things once we start to again shelve the new information into (possibly new) shelved for better processing.
Open-mindedness doesn't stem from the taboo of discriminating (aka selective) thinking. It stems from becoming aware of the process and doing the shelving consciously, repeatedly re-evaluating how we shelve.