I use blender and even I cant stand fags like that.
It's the same as mac fanboyism.
The blathering about him thinking Blender is superior is just stupid. It's a program, not a lifestyle (though some would like to think so). He's just trying to be an elitist, even though he's being an elitist with software that's LITERALLY FREE. Anyone could fucking download it and be on the same bragging terms as him.
I use it because I'm familiar with it, and I don't see a reason to switch. Granted other tools might work better, but for literally free, I get something that works for what I need it to. I don't feel like there's any reason to justify paying for max or maya (or whatever is standard nowadays). I do graphic design, so the 3d that I work with isn't constringent upon realism or "industry standard". Maybe someday I'll decide to use something different and take the time to learn everything from scratch, but what I have now fits my workflow.
If it aint broke...
That being said, blender isn't fully developed. And while it's video editor is actually pretty robust (honestly it's pretty good), it's still not up to par with After Effects. Your colleague is shooting himself in the foot because he doesn't want to learn AE, which could only help him. Honestly he could take a day to learn the basics of the software and pick up from there. It's not like creative skills don't transfer.
At the end of the day though, it's pointless to argue about it. If he does good work that's comparable to what you'd get in AE, then good for him. He may not be learning something new, but he's the one paying for his education I guess.