Why is "It's something to do" apparently a valid defense?

[Kallera]

Jesus, are people not allowed to just enjoy something without being criticised for it? Some of you people are so rude just because you're unhappy and can't let anyone else enjoy the content. Has it ever occurred to you that some people enjoy the game how it is?

I have seen the words salt and whining more times than I care to. It cuts both ways, until the devs respond or people unsub, which they have been doing.