See, you're making assumptions there.
I, for example, have never played 4E. I plan to try it when my two 3E campaigns are done, in about 6 months. But I have no idea whether I'll like it enough to want to switch from 3E. I'd say it's about 50/50 at this point.
So when you assume I'm calling this behaviour childish because I'm a 4E supported, you're just plain wrong. I'm calling it childish because my very reasonable interpretation (outlined nicely by doctorhook above) was that it was a childish outburst.
Stop trying to read motives into other posters. It's not cool.
Stop trying to read things into other people's actions posters talk about (i.e. "that's throwing a tantrum"). It's not cool.
It's the very attitude of "I am reasonable, my tastes are superiour, this is childish/stupid/whatever" that poisons many threads. Especially if it comes with the double standard of "toilet humor is ok, tearing paper up is not ok".