I was there too - NO BOOS and a LOT of energetic cheering for Our President and First Lady.
I was in the center top of the very back bleachers. The President was about as big as a matchstick from my seat, but it was still cool.
AND NO BOOS!
So was I, and I agree - nobody booed.
My son and I were directly opposite you. We were on the main floor, straight in front of the podium, about 40 feet out. My son is very tall and was able to photograph over the people in front of us.