Might have been that motion camoflage phenomenon (pardon my spelling), he may have thought you were going faster then you were.
Or he was jealous that he's been stuck in his tin box all day, and yet there you are overtaking cars and enjoying yourself at the same time! I can honestly say that I can't remember the last time I enjoyed driving my car, yet when ever I get on the bike I can't stop smiling, even when riding to work.
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