People have different tolerances for pain, humiliation, degradation. Is that from inception or is it learned behavior?

Could be either, but because those things are a part of life we do need to develop mechanisms to handle them.  Most of us try to minimize them as much as possible.  But some people learn more to live with them because they feel they need to because they are getting something for themselves from them or feel somehow they deserve them.  Or out of just inertia they are unwilling to get away from them.