2 Cor. 11:16-21 (ESV)
I repeat, let no one think me foolish. But even if you do, accept me as a fool, so that I too may boast a little.  What I am saying with this boastful confidence, I say not with the Lord's authority but as a fool.  Since many boast according to the flesh, I too will boast.  For you gladly bear with fools, being wise yourselves!  For you bear it if someone makes slaves of you, or devours you, or takes advantage of you, or puts on airs, or strikes you in the face.  To my shame, I must say, we were too weak for that!
But whatever anyone else dares to boast of—I am speaking as a fool—I also dare to boast of that.
The sarcasm drips from Paul’s pen! “To my shame, I must say, we were to weak for that!” How many times have I seen Christians slap another Christian across the face, and tell the man to turn his cheek? This is not Christian behavior. Christians are not called to put up with that. We do not let people call themselves weak, and then admonish us because they are the “weaker brother” not to drink a beer. This is nothing but hypocrisy. The weaker brother does not know that he is the weaker brother. We as Christians are set free, we must hold to this freedom we have in Christ with all tenacity. We do not let others enslave us, devour us, take advantage of us (think about that next time you pass a panhandler) put on airs or strike us in the face, and tell us to turn the other cheek. We have a duty for our weaker brothers to do the opposite so that one does not take advantage of them, and forgiveness in Christ for those times we fail.