Me and at least 5 other people i know had issues with the same dude, it's not a surprise he was arrogant with you, think the only surprise is that BC still keep paying his wages instead of telling him to look for another job, maybe work with kids, so he can learn how to be polite.
Suggest you join the club and boycott BC, just ride your bike 5min more and go to Edwardes in Camberwell, they got some good mechanics in there too, and friendly staff!
+1
Love Edwardes tbh with you