Just another day in paradise.....

Customer
" I need a main jet that goes with a 37.5 pilot jet"
me
"Well, it doesn't work like that I'm afraid"
Customer
"So what size main jet is standard with a 37.5 pilot jet?"
me
"There isn't a standard main jet size, all bikes use different sizes"
Customer
"So you can't help me then" 
me
No, I don't think so
Customer
You're very rude, F**k OFF THEN! (slams phone down)

​Is it me?