- So what? Who cares!
- I don’t care!
- It’s all the same to me.
- I have no preference.
- I suppose so.
- I don’t mind.
- It doesn’t matter to me
- Whatever (you want).
- Whatever you do?
- I don’t mind.
- It’s your decision.
- Who knows!
- Why should I care?
- It makes no difference to me.