What is "carpers"

Usage examples of "carpers".

Some notorious carpers and squeamish moralists might be sulky with Lord Steyne, but they were glad enough to come when he asked them.

All around me, I repeat, I seem to hear the angry murmur of carpers cavilling and cavillers carping.

And so what if the carpers claim "Poop" is really nothing but recycled "Fuck?

So they were, but if a man wrote such, the carpers would not've opened their mouths.