Tipping at a MAGA bar

Met a friend for a drink at a lounge near his home yesterday. Turned out their clientele were old men from the neighborhood who sit around a gripe about things.
There was a sign behind the bar: ”10% Tariff on all Canadian Whiskey and Tequila … Just kidding, but please buy American.”
I keep some Canadian coins in my car console since I travel there on occasion, so I left a tip - one Loonie (a Canadian dollar coin). Also left a note: “Next time I will tip one Peso. Just kidding, I won’t be coming back.”