Globals originally were a staff exclusive ability. Caution was exercised when that privilege was extended to the average user to understand what's appropriate to global. Slurs, swearing, casual chit-chat without advertising at all for any kind of event were prohibited since its conception.
If it were a benign offense, like saying something meaningless that wasn't actual event promotion, I'd often just go to the room of the user and tell them not to do that again. For more serious stuff, bans have occurred.