I haven’t seen a great deal of overlap between Nirthers and Troofers but where it does exist it seems to be among really hard-core racist crazies; Stormfront, Christian Identity, that kind of thing.
I believe, and I think most Lizardoids would agree, that Nirthers aren’t nearly as bad as 9-11 Troofers. The Nirthers are merely stupid and annoying, Trooferism is a disgusting outrage against human dignity.