On why it's a bad idea for your hairdresser to say you've put on weight:

"some background facts
women, when going for a haircut, are usually in a somewhat annoyed mood already because their hair is too long, flopping around their eyes badly, making them look shaggy and unattractive

so haircuts are usually relaxing experiences
a chat with the hairdresser also helps to restore good mood

now, in the light of these, being told by ur friendly neighbourhood hairdresser that you've put on weight, is something that disrupts this relaxation experience
the more a woman thinks a haircut should be relaxing, the more she will take offense at such a comment

it has nothing to do with customer service blah blah blah. which is what is commonly first assumed."


*cue*

... women