Can A Bus Driver Deny You A Ride Home From School Because Of An Instrument?

Context: I play cello. I’ve been playing it for 4 and a half years now and have ridden the bus home from school with my cello every week those past 4 and a half years. The cello case fits in the seat as if I were sitting with another person.

A couple weeks ago, my afternoon bus driver tells me that I cannot ride his bus with my cello anymore. He did not give any other context at all. The bus is my only way of getting home and my family has had to dramatically change schedule so that I can get home.