TÚ vs. USTED — how to not insult someone in Spanish
Every Spanish course teaches you tú and usted like it's a grammar rule. It isn't. It's a decision about respect, and you make it in the first two seconds of a conversation. El Mero Mero walks through register — when to be formal, when to be casual, and what happens when you get it backwards. Plus the Mexican expressions nobody teaches you: ¿qué onda?, no manches, qué padre, con permiso.