Disagree. It's harsh to make a point that there is no evidence they're telling the truth, not to be edgy or get attention. It would be better without the 'shut up' but a bit of an 'angry' tone is fitting.
Really, I'm more uncomfortable with a link to a webcomic joke as an argument point...
I'm just citing where I got the 'theory.' The OP of the comment could have made their point just fine without being confrontational or 'angry' as you put it. I don't see why people are defending someone's rudeness, you can get your point across without being a jerk about it.
The 'shut up' detracts from the comment. Being a jerk is bad.
But being confrontational is in this case a benefit. The first line is "Your claim that your product will not be discontinued is worthless." This is confrontational in a good way, and this line is not being a jerk. It's pointing out a serious flaw without attacking anyone.
It could be phrased differently still without insinuating that what they say is worthless.
Something like,
"How will you back up your claim of the product not being discontinued?" or "What will prevent your product from being discontinued?" Gets the same point across without coming off rude (it may just be me but saying "your claim ... is worthless" seems rude.) The OP of the comment definitely has a good point but it's said in a way that isn't constructive.
No it isn't. If I want to call the poster a fuckwad, I'll call him one. The only reason I linked the comic is because it may not be common knowledge to everyone where the 'theory' is from.
Then you're just poisoning the well with a bit of ad hominem (in a pretty stupid way), saying that someone else's opinion is wrong because they're anonymous when you're anonymous yourself.
That's the name of the 'theory' while it does imply that they're a 'fuckwad' (whatever that may be) it's not my chosen word to call them, I'm just citing it. But go ahead and defend the unnecessary rudeness and hide behind your throwaway account. I'll make it clear: The OP of the comment is being an asshole/fuckwad/douchebag/<insert word conveying sentiment here> by being needlessly rude due to the anonymity provided by having an online pseudonym.
Really, I'm more uncomfortable with a link to a webcomic joke as an argument point...