I don't want to tip the waiter.
That's not good. Why made you think to not tip?
I was having my morning coffee with my father, he told me it was rude not to tip
You don't have to tip anyone if you don't want to. However, it's typically expected of you to tip if the service was good.
I don't care about my dad's opinions. I'll do what I want with my money.
You don't have to but you will get bad service if you don't tip. People will also think you are cheap if you don't tip the waitstaff.