One of the issues we faced (and still face) is Ubuntu fan boys posting on the fedora lists and causing developer distractions.
I call "bullshit" on that. I keep a casual eye on fedora-devel-list and have not noticed what you claim. (fedora-list is already such a realm of chaos that I'm not sure that anyone would or could notice if it was problem there.)
One of the problems that Ubuntu advocates face are false claims like the one quoted above. An inordinate number of them (in my opinion) coming from the direction of the Fedora community.
Just to provide some context... I consider myself to be a member of both communities... CentOS, Fedora, and Ubuntu (roughly in that order) being the distros I rely upon to serve my customers' needs, and my own, too. I think that sometimes people here peg me as an "Ubuntu guy". And I do have an "Ubuntu hat" that I sometimes wear here. But my ties to the Red Hat world go back to 1997 and Red Hat 4.2, and are still strong today.