Was This Rude?

I'm a 21 year old that just graduated. Today at work I was packing and my boss walked by and asked how i was doing. I smiled and said, "Doing good. Making a lot of progress!" And he loudly sneered, "Or not" as he walked by. This guy is in his 40's and I felt really uncomfortable. show more I'm a 21 year old that just graduated.

Today at work I was packing and my boss walked by and asked how i was doing.

I smiled and said, "Doing good. Making a lot of progress!"

And he loudly sneered, "Or not" as he walked by.

This guy is in his 40's and I felt really uncomfortable.
Update: No I was packing a delivery for the order in the retail job.
Update 2: @Damien How is what I said silly or arrogant? I was trying to be positive.
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