I'd say kindness needs no ratio IDEALLY and it should be universal and impartial notwithstanding race, social standing or class, gender, religion or lack of it, nationality, age, physical attributes and even ideology.
What most of us do not often realize is that we share a lot in common INSIDE much more than we'd otherwise thought or believed.
You are as me and I'm as you. your impatience feels just like mine, your love feels just like my love, your disappointment feels just like mine, and your happiness feels just like mine too regardless of ALL.
Perhaps someday mankind will find a way or evolve to literally feel what others are feeling or like. That would be some dream
or a nightmare to some.