I suggested recently that part of the problem with with LW was a lock of discussion posts which was caused by people not thinking of much to post about.
When I ask myself "what might be a good topic for a post?", my mind goes blank, but surely not everything that's worth saying that's related to rationality has been said.
So, is there something at the back of your mind which might be interesting? A topic which got some discussion in an open thread that could be worth pursuing?
If you've found anything which helps you generate useable ideas, please comment about it-- or possibly write a post on the subject.
The only way I can see this as mind-body dualistic is by taking a very strong, restrictive sense of the phrase 'human biology' - one which does not already include those things that humans are biologically capable of without high-technological transhumanist aid. You assumed that the definition in use was one you would strongly disagree with, despite contextual clues that this was not the case: if the poster thinks that transhumanistic modifications CAN impact the sanity waterline, this person is clearly not a mind-body dualist!
Basically, you picked a fight with someone who agreed with you over something you agreed with them about and insisted that they disagreed with you. It's obnoxious.
When you're dealing with emotionally charged issues, you need to be very careful. It's not the time to run in throwing words into peoples' mouths.