Zhíxīncháng de rén suīrán róngyì dézuì rén, dàn méi shénme huài xīn.
Straight-shooters may offend people, but they mean no harm.
Tips
usage
Generally affectionate. A 直心肠 doesn't scheme, though they might blurt out awkward truths. Compare 心直口快 (same idea, more common in modern speech) and 直肠子 (colloquial variant).