Be all the same to somebody
Definition 1 of 1
Pro Tip 1/3Subtle Indifference
Conveys a subtle tone of indifference or detachment without being rude. 
Choose any restaurant, it's all the same to me.
Pro Tip 2/3Decision Making
Used when someone else is making a decision and you have no strong opinion. 
Red or blue? Either is all the same to me.
Pro Tip 3/3Flexible Attitude
Indicates a flexible or easygoing attitude towards choices or outcomes. 
Rain or shine, the picnic is all the same to me.