What's it to you, him, her, etc.? - Idioms by The Free Dictionary
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?