Why did I get scolded by my crush?

I was busy working on something at work and as I walked back to my department. My crush/coworker. Smiled and she sarcastically said "and where have you been?" I gave a sarcastic tone back to her and told her. I also was acting sarcastically smart with her and asked her if she could help me something and she had a big smile on her face and said "why are you acting like a douchbag?"

i asked her if I was trying to act like one and she told me "I don't know if you're trying" why is she doing all this?
Why did I get scolded by my crush?
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