He said he didn't approve of what I'd done, as if I cared. 他说他对我的所作所为不赞同，我才不在乎呢。
She called to tell me I'd upset Sam with my comments. As if I care.
She keeps sending me photos of her cats, as if I care.
So the first thing he wanted me to know was that he didn't judge me for my decision. As if I cared.
Anyway, he's not talking to me at the moment, as if I cared.
See also: care verb (WORRY)