Then you obviously don't believe in friendship between a man and a woman. Do you think all women are created just for our sexual needs? You obviously think too highly of yourself if you think any woman in any situation should be graced with your presence only if she's down to get laid.
It's a known fact that alcohol sometimes makes women do irrational things. Tomorrow she may regret flirting and kissing him(again if that really happened). And if they do click, then good for them but it will be on her terms, not his or yours