Those ******s may very well be the land steward, the people the land managers have contracted with to build and maintain the trail system. In such a case it is probably their responsibility to do this.

You must get permission from a landowner before constructing a trail. If you did not have that permission, then your "freeride" trail should be dismantled by all rules of sane-ness.

If you see other people building, you should strike up a conversation and ask if they are the land stewards. If this is the case, than these are the people in charge and you need to contact them before you build anything. You will find that these people are NOT snobs. They will gleefully ask you to join their club. Trail maintenance groups are sometimes perceived as exclusive, you'll find they need all the help they can get.

You will find that the land manager/owner has certain expectations in a land use agreement. Your free-ride trail may not fit with that expectation. In such a case, you may have to scale down your plans and spend quite a long time building a trust relationship by showing up for workdays and helping the people who have built everything else keep it up. After you put your time in, then you will have a say and can make a credible case for your style of riding after you consult IMBA standardized designs as well as consulting lawyers to check on the liability situation.

If "free-riding" means you can do anything you want anywhere you want, then you are fundamentally incompatible with the sport. You should be shunned and driven away and pelted with rocks anytime you step foot on someone else's hard work and labor. If you cannot work with others and compromise and play a part, then you cannot have a trail and you should go find another hobby. We don't need you in the sport tearing up other people's work and earning a bad name for MTBers with land managers.