Does wanting to walk off after a rude customer mean I'm not suited for customer service?

I started working at McDonald's a little over a week ago. Yes I post about my job a lot. Anyways, They usually have me run orders out to the parking lot. I'll be honest, some customers have to wait a while, because we are understaffed, and get overwhelmed. I took an order out to this older man, and his wife. I knew they had been waiting a while, so I apologized for the wait. The man snatched the bag out of my hands, and said "whatever". It took a lot for me not to say anything, but i just walked away. anyways, it ruined my night, and I almost walked off the job, because of it. I didn't because I'd be letting my co workers down.

Does wanting to walk off after a rude customer mean I'm not suited for customer service?
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