Because Tesla’s safety features apparently make it so that you can get away with driving drunk. Dude was obviously drinking a beer and everything. They told him they could tell he was drinking, to warn him because while they weren’t going to narc on him, someone definitely will, and he just sort of absentmindedly smiled.
I feel like I must ask then what exactly is "it" in response to this because driving drunk is incredibly dangerous and pretty much the most reckless thing someone can do in a society with vehicles. I sincerely hope this is a bit.