"Whopper farts seem like they take days to leave a room for me."
"Nah, that's how it is for us, too."
But even that is barely scratching the surface. Remember, he can move so fast that bullets appear to hang in mid-air, and he thinks at that speed as well. He's able to make decisions, to be present in that moment, at a thousand or ten thousand times normal speed. In other words, he doesn't think of himself as fast; he thinks of the rest of us as statues. For Quicksilver, standing in line at a grocery store would last the equivalent of years.
Bleached hair and goatees are back in style -- that's how far ahead he is.
Also, forget about normal relationships. Conversations would involve waiting hours for the next word to come out. This isn't just an annoyance, either. The brain needs stimulation -- stick a prisoner in solitary confinement for a while and they quickly lose the ability to form rational thoughts. It doesn't matter that, unlike the prisoners, he's free to interact with other people, because we're not people to him. We're snails. He'd never find anyone he could socialize with at his own pace. DC would never give up the rights.