Everyone can learn good relative pitch with practice. Music schools do this regularly, and it's just a skill you can pick up. Start by identifying intervals, then learn chords, and then learn to write down music you hear, and so on. It just takes work.

I wonder if there's a bit of survivorship bias with this one. I've never been able to learn relative pitch after trying quite a lot of different methods, ear training app and playing a couple of musical instruments. If you're in a music school then perhaps your baseline musical ability is already relatively high?