This argument always bothered me. For me, the ethos of open source and free software is altruism.
The whole point is that the developers make the software to help users. There's nothing gained by developers thought-endingly stating that the users aren't entitled to anything.
On the other hand though, it's not like users are saints either (for example, vanishingly few donate to the developers of the software they use) so it's a bit of a race to the bottom overall and I understand such sentiment.