> Little white lies are objectively okay.

They are subjectively ok. Some people believe lying is always bad.

I think the "true idea" (or let's call it "reasonable idea") when fully spelled out is "sometimes a white lie will be beneficial, will cause less harm, will inspire confidence in the receiver; and conversely, the harsh truth may harm them or be counterproductive". It's not the white lie itself that is the "good idea that is untrue"; the good idea is the reasoning behind the white lie, which is true.