The resolution 121 would be offensive for many Japanese, disappointing for pro-American Japanese. It is like Japan demanding the apology for the U.S.'s interventions of Philippines. Latin America, Russia.
But one good way to take an offensive remark is to accept the fact that that is the way he is and think that you can not change it, so let's get down to the real business with him, disregarding the remark.
Patrick Henry "ordered "diligent patrols " to keep Virginia slaves from accepting the British offer of freedom to those who would join their side," exclaiming "Would anyone believe I am the master of slaves of my own purchase, eight months after he gave the speech "Give me liberty or give me death" . (page 146Lies my teacher told me James W. Loewn.)
Thomas Jefferson had 175 slaves at the time he wrote "everyone has an equal right to "Life, Liberty, and the pursuit of Happiness".(page 146)
Woodrow Wilson advocated "" 'Self determination' is not a mere phrase," Wilson told Congress; "it is an imperative principle of action which statesmen will henceforth ignore at their peril." Later he referred to "the free self - determination of nations upon which all the modern world insists." while rejecting Ho Chi Mins's appeal
to him at Versatile for self-determination and letting France retained control of Indochina, vetoing a clause on racial equality in the Covenant of the League of Nations proposed by Japan.
No wonder the U.S. accuses Japan who has made several apologies, without facing the fact that the U.S. has committed the same kind of crimes in the backyard---That is the way she has been.
update:A commenter Matt suggested I was generalizing. I had no such intention, but, I should have been clearer. I should have said here some of lawmakers accuse....instead of the U.S. here. It was misleading. I apologize.
In addition, one might console himself, uttering "syouganai, it is all politics" in the spirit of Kyuma, taking note of the fact that not all Americans are like that.