Why didn’t Eisenhower and other American generals salute Wilhelm Keitel ?

In May 1945 . American and Soviet generals met with the German High Command where unconditional surrender was agreed on and signed by the German generals. When Keitel walked into the room Zhukov and Eisenhower amongst other allied generals were sitting they didn’t get up , when Keitel saluted then none of them... show more In May 1945 . American and Soviet generals met with the German High Command where unconditional surrender was agreed on and signed by the German generals. When Keitel walked into the room Zhukov and Eisenhower amongst other allied generals were sitting they didn’t get up , when Keitel saluted then none of them returned the salute.

Don’t you think this was unprofessional for the generals to not return the salute? I mean the war was about to be over so why hold grudges? I understand the Soviet perspective after all they had a bloody war with the Germans , but why were the American generals sour ?
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