I have never had to race anyone bushwacking Trails are there for a reason, people walk (and sometimes run) on them. I am sure the trails were there long before the internet. Hurrying to get in front of someone seems like poor form to me and I can't say I would do it. Sometimes I feel bad for pulling up at a trailhead packed and ready to go while folks who got there before me are still gearing up. Some friendly small talk and avoiding the appearance of rushing usually cuts the tension. I don't think it would be reasonable for them to expect me to wait for them to lead the way though.

The folks willing to pull that kind of stunt rarely have the hot hand, and catching fish in front of them is an easy to to win a silent victory and a perfect segue into an educational opportunity.