People who get cross with those reading music and not playing by ear
You can use both skills and lots of people do. If I hadn’t learned to read music as a child, I wouldn’t have discovered half the tunes I really love. I was a solitary person and just delighted in making discoveries in library books.
On the other hand, nowadays I don’t use sheet music much to play but try to play by ear. I expect in sessions plenty of people learn a tune from the sheet and then don’t need to follow the notes any more? This is a muddling sort of subject perhaps - interesting to see what people say.