Got some lip from a trail runner on a trail I've been riding on for yrs. I know I've seen others riding it and done some group rides (a Nemba ride too) on it too. So wondering, are there any trails not OK for mtn biking in foxboro ? Who says so ? and if so how do I help to change ? The double wides are NOT an option.

trail in question: If you start at the ranger station go straight thru the 1st three way to the next 3-way head left, then about 100 yds on left a trail heads off behind some new houses. My first question is he right ? 2nd why ? never seen a runner clear any stick or fallen stuff. if I am getting kicked out more questions arise like why would I ever help clear these trails.
thanks