Pardon my manner, but I will not be subject to your assumptions of my character.

Excuse my retort, but I will not stand for ignorance or stupidity.

Permits my transgressions, for I am sorry it cannot be helped that I will stand for what I believe in and if I feel threatened- when I am cornered my gut move is to 

Act first think after.

I am truly sorry you learned this the hard way.

Perhaps I should now make it clear,

I do not take lightly to offense.