I think you're being uncharitable towards option 2. When a physicist says "nobody disagrees that perpetual motion machines are impossible", are they saying that

I think you're being uncharitable towards option 2. When a physicist says "nobody disagrees that perpetual motion machines are impossible", are they saying that Jimbo who thinks he's built one in his garage is subhuman? Of course not. What they mean is that all experts who've seriously considered the issue agree, and they see so little substance in non-expert objections that it's not worth engaging.