We agree on that :)

I tend to look at the factual content of a contribution and less at the tone. It's like the RMS/Miguel de Icaza thing but in miniature, if you 'leave' open source after having used it you're almost worse than if you were a windows user all your life long, and I think the moderation in part demonstrates that. If it's just about the tone that's different, but since 'tone' is hard to gage it's a bad reason to moderate for, unless it is crystal clear that the words are offensive or rude. In this case 'linux' and 'open source' are not people, so they can't be insulted and 'yay open source, yay linux' can be interpreted as showing that not everything is good and great about linux and open source, which is undeniably true.

It's significant in this case because in closed source there is usually a solid ($) reason to keep your customers satisfied, in open source much less so because plenty of the people there do it on a volunteer basis, so you have to be 'happy you got it in the first place'.