Is it the usual place you go to get your hair cut? Maybe she was just having a bad day.
You're not one of these guys who is a slob but somehow is very particular about some frivolous shit? If you're a fat, smelly, unkempt p.o.s. but then you request/expect meticulous treatment in one aspect (such as your hair), then don't be surprised when the barber doesn't take you seriously and half-asses the service.