[Dylan16807]

It's more subtle than that.

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.

[wldcordeiro]

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.

[hueving]

But that's precisely what he/she needed to insinuate. That claim is worthless to the users it's targeted towards.