Having a different opinion does not constitute a personal attack, whether you are on the side of the mainstream or the fringe. It is true that so-called mainstream scientists will use personal attacks under the guise of having an honest difference of opinion. An old Martin Gardner article was stunningly bad that way, and he was the math guru of the 1950s. And no, "being wrong" does not justify personal attacks.
I haven't seen any of that going on here, but I want moderators to be aware that some people do it, and watch out for it. It's not the subject matter. It's not the side you are on. It is the way you present your opinions.