That is usually something the actual church imposes though, not one of the main tenets of the leader.
As far as the 4chan protests go, I think that they are not particularly bad, I do believe people should have the right to believe in anything they want, but I also reserve the right to mock and ridicule them as I see fit.
That's just the thing, though. the Anonymous protests aren't directed at the Church's beliefs or anything benign like that, they're directed at the way the Co$ blatantly lies, steals, brainwashes, intimidates, extorts, blackmails and denies people of psychiatric and medical care that they genuinely need, purely so that the organisation can make a quick buck.
Take the case of Lisa McPherson - Not only did the CoS remove her from the hospital where she was receiving urgent medical and psychiatric attention after a car accident, but when she later turned up dead having been in the CoS' care, the autopsy ruled that she died of neglect, dehydration and starvation. she was covered in cockroach bites, too. You can find the autopsy files at xenu.net (you'll need a strong stomach) - the Co$ told her family (many of whom are still cult members to this day) that she died of meningitis.
If Anonymous were just protesting the "Church"'s religious beliefs, then the claims of religious bigotry and intolerance would be right on the mark. Instead, the protest focuses on the Organization's sinister business practices that have grown up around that belief system.
I could care less if they want to believe in Xenu, or the Galactic Confederation, or Thetans, or any of that lot. People are free to believe whatever they want in my view - I draw the line at (sic) "taking any means necessary to destroy [their critics]".
These people devote thousands of dollars and considerable resources to trying to drive their critics and opponents to suicide. No legitimate religion does that.