This! I've always had super friendly interactions with Genshin co-op, even when searching through the co-op tab rather than looking online (aside from one kid I had to kick because I was not going to buy them a welkin lol). The only time I've come across problematic behavior is through social media. It's also very popular so of course on twitter and reddit there is going to be a large loud volume of immature people, but that's most games. In game people are usually good.