Oh God, my brother’s partner was like this and it would drive me mad. Similar to your example, I distinctly remember when the Freemasons released their cover of Alanis’ Uninvited. Knowing I was a huge Alanis fan, he kept trying to convince me that Alanis had covered it and that the Freemason’s was the original. Even going online and showing him that she had released it almost ten years earlier didn’t convince him. Some people are just so stuck in their ways and refuse to listen to others. It boggles my mind. I think the way to deal with them is just to not engage in the conversation. Send the proof that you’re correct and say no more about it.