You've not lived until you've had a lager and gin & tonic and Baileys Irish cream chaser.
He was firmly asked to leave - and lucky that was all. I imagine he wasn't the first uninformed tourist to make this request. Years later, I likened it to ordering a "9/11" in Manhattan, although it's not a perfect analogy.
They were usually dealt with by referring them to history section of their Lonely Planet.
¹ Several car/truck bombings with considerable property damage, although usually limited casualties.