Remember what the jersey says..."Experience counts..." Let the young bucks charge off. Ride for you not them. If they are just lucky enough they'll reach a point in their lives where a good warm up is important to them to, and learn that fast isn't always better.

Edit/Addition:

Stapfam, the more I think about this, the more I think there is a lesson to be taught. If I remember correctly you've invested time, knowledge and a bit of money in getting these guys out there riding. For them to treat you this way seems a bit disrespectful. Maybe before the next ride you should get them away from their bikes just long enough for you to unscrew the Presta stem core a half turn and then put the valve cap cover back on. Just a thought....