Correct. I personally think those who hold ridiculous beliefs are themselves ridiculous, and I will tell them that. But when I tell them why their claims are ridiculous, they have no legitimate grounds for offense. I give them plenty of that elsewhere
Edit: I see how this may be misleading considering my later posts, so I will clarify. Telling someone they are ridiculous is not necessarily insulting. I've talked to a Witness once that was having a lot of troubling answering direct questions and was tripping all over herself, and I told her quite plainly that she was acting ridiculous. And she received this well. There was no offense intended or received. She knew how she seemed and tried to correct herself.
So no, I don't think it is out of line at all to call someone ridiculous for believing 2 of every animal survived 40 days in a wooden boat. It would be out of line to call them a dumb c**t, but they are being ridiculous and should be told that. If they want to take extreme offense at this, that's their own problem.