Yes, they are.
Consider that a 2d image is made generally by manipulating brush tools, and a 3d model is made by manipulating points in a virtual space. Flames are made by manipulating values (much as a dj manipulates various switches and sliders) to create the desired effect.
Technical art is still art.
Explain to them nicely that there is no place to post and critique flames, within the rules, except art.