I said this in another post, but I'll post this again here:
You get hipster by "naturally" obtaining zero star ratings from 12 customers. By "naturally," I mean NOT by killing them but from them leaving the hotel with a zero rating. Tip: It is much, much easier to get the zero rating near the beginning of the game.
A very easy way to get zero star ratings later in the game: Instead of rooms just put 2 Amenities on the first floor and replace all alipin rooms with other ones. Set priority of all customers to first floor/alipin and restrict all other rooms. Now all customers will leave the inn without checking in. Beside that approval rating will decrease.
actually.. you can just change the room setting to Restrict, and change the setting in the check-in to a room that you have not built yet, say the Datu[the last room], then you are able to turn away customers w/o destroying any rooms!