3.5 miles each way, that's 7 miles a day....140 a month.

So, and how much does this guy ride? ;-)

Sounds insecure to me.

I have a similar situation on my current work location. A 28 year old guy shut up when he was bragging that first trip upstairs in the morning he takes the stairs. Another coworker pointed out that I take the stairs on every single trip in the bldg at the ripe age of 48. This week he noticed my taking the elevator "tired?" he said. "No, rest week". Not a peep now.

Or, some Monday around the water cooler calmly mention the 30, 60, 100 mile ride you did or are training for. No a problem, you ride every day.