That's because nearby pilots gunned their engines and Johnson's words were lost in the roar. (One assumes that the pilots were either mischief makers or Richard Nixon supporters... or both!) LBJ was not happy about that. Not one bit.
Here's a shot of LBJ during happier times, as a college student during the 1920s. Weird, huh? Like you, I'm so used to seeing the statesmen of yesteryear as older adults, this goofy young man takes some getting used to.*My sources are here.
