"Good for you." is easily in my top 5 most hated phrases. It's the height of condescension and completely dismissive. (I'm also not a fan of "Ok" when it's not part of another statement.)
It depends on *how* it's said. - Stephan Planken
If it's said with an exclamation point, there's at least a 90% chance it's said in a positive way. With a period, nope. - Heather
I agree with that. I used to work with a guy who said it frequently, but clearly in a very well meant, encouraging way. - Stephan Planken
OK - Winckel