I snapped at a coworker and now feel like a bad Christian—how awful was I?

I got little upset at this guy coworker and when he said have a good one I replied back and said have a bad one….. he went told my friend how he didn’t think I’d say something like that especially for someone who goes to church, is that quite awful? I feel embarrassed

I snapped at a coworker and now feel like a bad Christian—how awful was I?
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