It's a matter of degrees I think. I scratchbuild, build from kits, fly(and assemble) ARFs, and have even been known to throw a RTR or two in the air. The more work I have put into a plane(not to mention the blood, sweat, and sometimes tears), the prouder I am when it actually leaves the ground and flies in some semblance of "control".
Can you be proud of an ARF? Sure! I think the point that the "builders" are making is that on any given day, you might see 10 (insert ARF here) lined up in a row, all the same. Part of the appeal for me is seeing and building/flying unique or different designs, but everyone has their own way to enjoy their addiction.
Two more cents...