I've noticed the usage of memes in other games, and some of those games aren't really directed towards children. Memes are a part of modern pop culture now so it's something you have to get used to, because when Japanese games get localized and translated, translators tend to use memes for things that would be inappropriate to translate literally (which would end up confusing westerners). None of your examples are really memes, but just ways people would normally speak given those circumstances, so it makes things more natural for those who speak English.