Yeah I see your point Nova I can see how that could be regarded as bitter.

However bitterness didn't really cross my mind when I thought it seemed perfectly valid to say that. If the behaviour of a girl or group of girls is orchestrated specifically to make you feel like shit, should you accept that and just walk away? Or should you speak out and tell them that you find their behaviour unacceptable??

Saying 'Sorry, I thought you were friendly' calmly and with a smile on your face then walking away is a subtle way of saying someting to the effect of 'Your behaviour and attitude is pathetic, grow up you stupid cow!'

If you just walk-off it just reinforces to the girls that they're behaviour in treating guys like that is acceptable and unquestionable.