They are johnny-one-notes and Asberger-obsessives...and a good way to avoid them is to enjoy all the other interesting FR conservative arguments going on that do not concern evolution. But they tend to be nasty little Girley-Men bullies, so it's a kindness to warn other freepers who might get caught up in their IM-coordinated two-minute gangups.
I've noticed that lately they stick mostly to talking to themselves, which is a kindness. I wonder why it has to be a public chat, though? They need an audience for their high-five parties? Then again, It probably gets lonely herding sheep up on that mountain.