"He's a human! You're a mermaid!" "I don't care!"
Now this is something great about the love that Ariel has for Eric! (We'll ignore the whole they don't know each other thing for the sake of this card, ok?)
Here's what's important: she doesn't care about the stereotypes and things people have said about Eric...she loves him anyways! While you can debate whether or not a mermaid and a human man can be together all you want, let's say this: maybe in another world she was a rich girl, he was a poor boy. She doesn't care. She doesn't care!
She loves him for him, not for what he is, and that's beautiful.