Was this employee at Mcdonald's really rude?

So here's what happened. I went to this Mcdonald's which has a buffet and you can actually order if something isn't on the buffet. And I didnt see any Big Mac or Cheeseburger on the buffet line so I went to another line where you special order food and I asked the guy for a Big Mac and he gave me a weird look and breathed hard and he said: "here!" and I opened the Big Mac and it looked all squished and I said to him: "This doesnt look fresh. Can I just order a cheeseburger?" Make that 2 cheeseburgers actually. They arent on the buffet either." and he said in a impatient sarcastic way: "Jez so now you want me to make you a cheeseburger? Thats alot of work for us!! Just because you dont want a big mac!" and I shrugged and he just went in the back of the kitchen and was making it and cussing to himself: "F*CKING MORON!" And before he brought the cheeseburger out, I saw him in the back spit in it and put something nasty in it!" but I was afraid to say anything to him so I took it and threw it out after I got it. What should I have done here? Was this employee really rude?!