gaaaaawd, i remember the clashes we had up here in BC, when the North Shore was (and is!) a hotspot for hardcore mountain biking. Clashes (violent ones at times) between hikers and bikers, up to the point of angry hikers imbedding nails and spikes on the trails, and in several extreme cases, thin wire at neck level strung across faster parts of trials, resulting in major injuries to several mountian bikers. Trail closures, outright bans, which led to secret trails being built, then more fights, bla bla bla. UGLY!
I hope treeclimbing never gets like that.
only negative response i have had was a grunpy old man walking his dog, who grabbed my shoulder as i was checking my gear on the ground (in a PUBLIC forested park). He spun me around, yelled at me "what do you think YOUR doing?" in an aggressive tone. I used non violent crisis intervention techniques and replied in a low, calm voice "treeclimbing, to count birdsnests". He got surly with me and barked again "are you allowed to do that? i don think you are!!!" i lowered my voice again, and "well sir, i'm sure if there is a problem with me being here, the Proper authorities will let me know. ". he grumbled and stormed off.

Parks Guy came by a few hours later, looked at me up in the tree, waved hi , asked a few questions about the gear. when i told him i was using non invasive techniques (cambuim saver, soft soled shoes) and that i was'nt a tree spiker or an environmental terrorist (we have that problem up here bigtime), he said "well, enjoy the climb!, just no climbing over any paths". I thanked him and enjoyed my climb! .
