Kid Flash didn't seem to register the parental tone. Honestly, all grown ups were starting to sound like the ones in Charlie Brown-- wahwahwah wah wah wahwah-- when they took that tone. It had become white noise for Bart; put a scolding parental figure in front of him for long enough and he'd be snoring like a baby.
Kid Flashed stuffed the remainder of the popcorn in his mouth and spoke through it while trying to chew at the same time, "Nof! Waal, fis fun taim I fuzz fif--" Here he managed to swallowed, "the Flash and we totally saw this huuuuggee thing with these big bug eyes slowly rising out of the water! It was big! like a T-rex but bigger! And then everyone ran away and they were all like 'Oh no!' But their mouths kept moving after the sound was done coming out? so it was really weird." Bart paused for a minute, "Wait no. That was Godzilla. You ever see it? Good flick."