Earlier quoted context omitted.
It's one thing to complain that another company built a design largely influenced by yours. And that's a legitimate complaint, although the most you can do is say "Imitation is the sincerest form of flattery" This is wholesale ripping off (in particular, indicated by the direct linking to 37signals site assets). I would be pissed off too if I found that my bandwidth was being used to serve another company's site. Esp…
I still don't see how any of this validates such an immature response from the copied company. Don't they have a PR guy or something to shut them up before they say things they might regret?
Calling them out in no uncertain terms was a community service. Let's not quibble over vocabulary.