Let me use language that will perhaps resonate with people here more: doing this makes you a bully.
People do take things personally. This isn't constructive criticism we're talking about. It's not even a criticism of the product itself. It's making fun of someone for getting burnt out.
I hate that I turn every debate into "it depends on where you draw the line" but it really does. There is a continuum between my-first-open-source-project and Apple. It would be absurd to suggest to someone that they shouldn't make fun of Windows 8 because Steve Ballmer might get his feelings hurt. It would also be absurd to suggest that every kid who proudly uploads his/her first program to github deserves to be slammed for its shortcomings. It's a continuum.
While I see your perspective, I think it's going to get pretty boring around here if we have to walk on eggshells for fear that somebody who probably isn't even paying attention might be offended at a jovial (if accurate) characterization of one of their shortcomings.
He called it abandonware. He didn't say "fuck you." He didn't say "he's a shit developer." He called the program abandonware. Have a sense of perspective already. Frankly, I'd find it insulting if you were defending me from the tiniest barbs like this. Onlookers couldn't help but conclude I'd be knocked over and bruised by a warm breeze.
The best quote I've read on the subject was that if people care enough to complain about your product, that means you did something right.