Saying a woman who "doesn't have AT LEAST a D cup, she's a HE!" is not an opinion. Saying a woman who "doesn't have AT LEAST a D cup is not attractive to me" is an opinion and that is okay.
D-cup breasts are LARGE, they are NOT the norm. The average breast size today is 36C. A few years ago it was 34B so I believe the numbers of today are skewed because of breast implants. So if the average NATURAL size of breasts is 34B then requiring a woman to have a D cup to be female is like requiring a man to have an 8 inch penis to be male. Now, I do not know or care how large yours is, but I am assuming that alot of men out there would be very unhappy to find out that they are female because their penis is average (5.1 to 6.6 inches according to a survey from The Kinsey Institue and UCSF.)
Don't get me wrong, I'm definately not trying to make you change your mind about what breast size you find attractive, I just thought you should know that you weren't expressing your opinion, you were being overly harsh and judgemental and condemning women as being "male" simply because their breasts are average.
And yes, I obviously know you were being sarcastic about them being male, but your wording was rather... off.
