It is seen as extremely rude. If you are picking up the bill for a party or a date and don't tip, it will shine a very negative light on you. And whoever you ar

It is seen as extremely rude. If you are picking up the bill for a party or a date and don't tip, it will shine a very negative light on you. And whoever you are with will probably leave the tip behind in your stead. EDIT: If it was obvious to everyone that the service was bad, leaving without a tip will be fine.