While they were criticising the game's ending, they didn't do it very constructive manner. Which then caused the dev to respond in that way, since it wasn't the only one that was pretty unconstructive in it's criticism. It made the criticism sound more like "do the ending this way" demand than constructive criticism. Now i agree the ending wasn't great, though it wasn't that bad either, and there's plenty of there that could have been better. But how you word these things are important in how you get your point across. Best constructive criticism gives valid points on what was good and what didn't work and why, without coming across as something that makes the creator feel like they are attacked.
Also just telling someone to grow thicker skin, after they feel like they've received unfair treatment doesn't work. It's like saying to kid that is bullied in school, to just ignore/tolerate their bullies and what the do. I'm not saying that the dev feels all criticism is unfair, it's obvious they don't. But comments that just say the ending sucked, when dev has spent hours upon hours to create their product, will feel unfair attacks.
In worst case that kind of behaviour from the so called critics can lead devs even stopping their projects and never publishing anything again. I've seen it happen multiple times on this forum, where people bitching, not giving good criticism, about something they didn't like basically bully developer into leaving. And we all lose in those scenarios. Now i know there's people who say you can't be bullied online, but you can, it's when people basically drive others away from forums/sites with their constant negative comments.
