Is it ever acceptable to cuss at fast food workers over long waits?

I work at mcdonald's. The drive through was backed up, and there were a lot of people in the restaurant waiting for orders. I noticed a couple had been waiting at a table for a while. I walked up to them, and said "mind if I ask what you guys are waiting on?" The woman was like "we are waiting on our fucking food" thats what I meant and I know she knew thats what I meant. I juts wanted to know what they ordered so I could go back and see what was going on with it. I went back and looked for their order.

It was a pretty big order with a lot of drinks. Honestly. There wasn't a very good reason we hadn't gotten it out yet. We were just busy with a lot of other orders. I apologized profusely, and offered them shakes. They said no. They said they'd been waiting for 45 minutes. The lady once again was like "this is fucking ridiculous" she calmed down a little bit, and said that it wasn't my fault and she realizes we are busy. Was using fowl language warranted in this situation?

Is it ever acceptable to cuss at fast food workers over long waits?
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