A friend gave up drinking earlier this year. That's fine and completely her decision.
I rarely drink, and honestly get 'drunk' maybe twice a year - and by drunk I mean just quite tipsy, not Drunk with a capital D. Due to health reasons, I didn't drink at all for five years, and it's only the last two I've started drinking occasionally when out / at a party.
We're off to a mutual friends party in a few weeks. I plan to have a few drinks. The friend has already started with the sanctimonious "you'd enjoy it so much more if sober", people don't need to drink to have fun, you should try not drinking etc etc.
How do I politely tell her to shut the fuck up. Yes, I don't HAVE to drink, but I'm choosing to. I like occasionally getting a bit tipsy.