I’ve heard it explained that “hey” used to be more of an urgent way to get someone’s attention, rather than a casual “hello” like it is now, so it sounded rude to some older folks.
I’ve heard it explained that “hey” used to be more of an urgent way to get someone’s attention, rather than a casual “hello” like it is now, so it sounded rude to some older folks.
To add to this: strong language skills are also what allow you to understand those without them.
I think the common conclusion of “Well, you understand them, don’t you?” is flawed because it still relies on the receivers to have a strong grasp of language.