[Oh yes, he's back to flustered and blushing again.]

Yes, that's the case. Other birds can only have some of your attention. If I whistle the things I did with you at them then it wouldn't do anything, but if you whistled it they'd all start bringing you presents and singing you courting songs. [And that is rude of them. Clearly Marco should be bringing presents and singing courting songs. Wait. What.]