Hello Hatpin,You can refer to me as the younger generation all you like, I'm 46 so chuffed to hell when anyone does:)
Bird is such a commonly used and universal phrase to refer to a girl or woman that it honestly never struck me as offensive and you often hear blokes refer to women as a "stunning bird" or "pretty bird that works at the garage" and it was always my belief that it came from the word "burd" which meant originally beautiful and later was taken as a word for woman ( origins Norse).
All that being said, I'm not English (Irish) so we might have missed out on the rhyming slang type "ready for plucking" thing, so it may not appear to me as bad as it obviously does to you.