treat someone well/bad/right/like dirt/with justice/equally...

well iyi davranmak

bad kötü davranmak

right doğru davranmak

like dirt: bir hiç (means like a zero) gibi muhamale göstermek – check this one again, maybe someone can find a better translation

justice: adaletli davranmak

equally:  eşit (eşit ölçüde) davranmak

ex: Osman´a iyi davran! Treat Osman well!

davranmak seems to have a wider meaning than the English behave.

I often see it used with karşı also. Could it be approximately

                   birine karşı kaba davranmak ´behave rude towards someone´

                   birine kaba davranmak ´treat someone in a rude way´     ?

I wonder if Turks even see a difference here.

Anyway, thanks huko.

silaha davranmak = to draw a weapon

cebine davranmak = to volunteer to pay

şüpheli davranmak = to act suspicious

you´re right and there is no difference in this case between birine and birine karşı

another example:

birine karşı mahçup olmak (to be ashamed)