that's mean - I'm sure he doesn't think I'm stupid.
Deaf culture is blunt. Bottesini is even more so. If you want to engage with Deaf people, you need to have a thicker skin.
Instead of getting your feelings hurt, try to think about what she said, all of what she said, not just the part that hurt your feelings, and why she said it.
Your first post did reveal some assumptions that are odd.
Why do you think deaf people cannot talk about sports? I'm hearing, and many deaf people know a lot more about sports than I do.
There are also deaf musicians. Google Signmark and a Deaf rapper named Sean. I have a deaf friend whose favorite part of church is the song service. She cranks up her hearing aids, and if somebody loud and with the right voice range is sitting near her, she can sing. It's not quite the right pitch, but it's not terrible bad, either (my hearing husband's pitch is worse) and I can't understand what she's saying if I don't have the book, but the point is- SHE loves it.
Sean Berdy, who plays Emmett on Switched at Birth is deaf, and he plays the drums.
Google the Fight Song for Gallaudet- it's pretty cool to watch.
If you want to talk to this boy talk to him because he's interesting for his own self, not because you pity him. Choosing not to mention sports because you don't think deaf people can enjoy sports does sound more like pity than genuine interest.
Don't be totally discouraged. You can learn from this. You can learn a lot from Bottesini if you're willing to think about what she says and accept that she will never sugar coat anything. Pity once informed can grow up to be something else, something more acceptable.