This guy at work is persistent about riding with me. Personally, I don't like spending time with anyone at work because it's bad enough that I have to see them everday for 8 hours...Don't get me wrong, I like riding, but I really dont like spending time with people from work

He claims that he just got a Trek 1000 and he has been riding almost everday for 10-15miles...

He said he wants to try 30miles with me. I am not really his friend or someone that I would talk to outside of the work environment, so I am unsure. He keeps trying to show off by showing me his calves and how he passes people all the time. He also said he is getting a discovery jersey soon lol.
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The funniest thing is that he thinks I ride a beat up old bike or a MTB. He keeps talking about how 15miles is hard and that I might need a phone so I can call my house for a ride after 20 miles. This whole time, I've been neglecting to tell him that I ride regularly and that I can do much more than 20 miles.

So should I go ride with him or is it a waste of time? I think I might go out there with my MTB and drop him . This is going to be fun, I just have to put my Look pedals on the MTB and I should be set. The seat is as high as it will go on the MTB(its not really my size). The MTB is equipped with LOW bottom of the line Shimano(Acer I think, lol). I think this bike was bought at ToysRus 5-10 years ago. Last time I checked, the FD was bent and half of the gears did not work. I am not sure about what kind of speed the MTB is capable of as it doesn't have a computer.

What do you guys think, should I bring out the MTB, LeMond or not go?