Frankly, Shrike is a little too preoccupied at the moment to be concerned about whether it's rude or not. And he would have to admit that he's the one who chose to try the beverage after having it described to him, anyway.

That said, he gets over his surprise fairly quickly, only for it to be replaced with...

"How peculiar. How is it achieved?"

And now the inquisitive nerdy side is showing itself.