No, what they are saying is that they are the major contributors, which is actually true. So GTK is catering more and more to THEIR needs. Of course, this being Slashdot we should force their developers do things that WE like, despite us not contributing a single line of code.
I disagree with many of the design principles of the new gnome, but they are not obligated to focus their resources on a path that they don't want to follow. I don't see anyone giving shit to the people at Englihtenment desktop for writing a toolkit (EFL) that looks foreign on any other desktop environment.
Open source used to be about scratching your own itch, not forcing other people to solve your problems. If XFCE/LXDE likes GTK 3 but not in the way gnome devs want, publish patches to GTK3 allowing their code. If their patches are rejected, then we can really talk of gnome devs being a little dickish, but still the solution in that case is forking.
Then again, is easier to complain on the internet than to actually contribute code.