We had a "crazy" lady at our barn a couple years ago and she went into a "break" so to speak and told us if we didn't take off all the shoes on the horses, got rid of the bits and saddles, jumps, whips, and other misc items she came up with that she would call the police. I can blame her mental state of mind, but for others its really a matter of a difference of belief. Its not really worth me getting upset about it because its not like I can change their minds. People will agree to disagree constantly in the horseworld, hopefully.
My advice to you is to block their posts so you don't read them. Then go about your own life and what makes you happy and continuing with what you believe in. Sometimes people choose different paths but it doesnt necessarily make it a wrong one. Its just what works for them, which is okay. Everyone is different.
In riding, a horse's energy is like a river- guided by the banks but not stopped by them.