Some customers are such pricks

So I was working at Subway today. Customers are usually nice to ok, but not this one.
I'm working on veggies in the asseline we make when we have at least 2 customers, which we had three; a guy in a yellow shirt (unimportant to the story) and a couple, man and woman. I can't remember what the woman ordered, but the guy ordered a bmt (pepperoni salami and ham) on italian. Normally italian bread is a whitish color, but it occasionally gets a bit browner when we make it. It's still ok, but just not as soft.
So I finish with the yellow-shirt-guy's veggies and finish him off on register. I grabbed some more gloves and went over to the couple and asked what they wanted on the one in front of me, and the guy says he wanted it toasted. So I toast it like he wants while George (another employee) works on the woman's sub. After it comes out of the toaster, it seems a bit dark, but still fine. I ask him what he wants on the sandwich and he asks for light lettuce. I put it on, very lightly, but he says "even lighter" a little agitated, even though it's pretty much as light as you can get without just scraps of lettuce here and there. So he gets a few other things, and by the time I'm finished, George is done with the woman's so we're both starting to wrap the sandwiches when he askes, sounding slightly more agitated, if his is burnt. I don't think it is, so I look over at George, who says "no." The guy must not have heard him because it turns out he had been starring at just me for the answer. By that time I was starting to hear him use the F-word a few times, though not too loud.
I put the wrapped sandwich in the bag along with the one George wrapped, and hand it to the two while asking if they want a meal (which we're required to ask). The woman says no thanks, but the man is already taking his sandwich out of the bag, looks at it, and says "what the fuck!" He goes off on his woman complaining how he believes it's burnt. So the woman asks us if we could possibly remake it, which George goes to do, trying to avoid anything too bad. He looks at me and says "I asked you if it was burnt but you just fucking ignored me!" So I start to point at George about to say "He told you it wasn't." I guess I must have started to make a small shrugging motion while I did because the next thing I got from him was:
"DON'T FUCKING SHRUG YOUR SHOULDERS AT ME, ASSHOLE!"
All I could do was stand there and quietly say "sorry." Then he starts saying stuff like "I come here 40 times a week," "I've never been treated this way," and "I'm never coming here again." On the last one I was tempted to shout "GOOD!!" So I have to redo the veggies for him, all while being treated like shit. During which, I started making a list of things I should've said to him (good thing I didn't, but it would have been so satisfying):
"I'm gonna venture a guess that you're either unemployed or that you don't work around other people."
"I swear, if I didn't have to make this sandwich in front of you..."
"Sheesh, what crawled up your ass?"
"You must be great at parties."

So after I remake it, the woman politely thanks us for making sandwich again. But then I notice that they're leaving with all three sandwiches! Wait a minute, so your bitching at me, and you're getting free food for it?? What the fuck is your problem!?!? I'm so glad he said "never coming here again," or I'd probably greet him with "Hey, assface." Hope that woman dumps him soon, while it's still early (our manager said she always comes in with a different guy.)

Asshole.