what's it to you, him, her, etc.?

What's it to (someone)?

What does someone care? What business is it of someone? Usually said out of annoyance or anger. I pay my rent and my share of the bills—what's it to him how I spend my money otherwise? What's it to them what I do on the weekends? That's my time to do as I like!

what’s it to ˈyou, ˈhim, ˈher, etc.?

(informal) (said when you are annoyed) you, etc. have no right to know something; what does it matter to you, etc: What’s it to her how I spend my money?