Meanings of sneered crass in English

'And,' sneered Crass, 'those who are engaged in unnecessary talk.'

'But then you see we ain't shipwrecked on no dissolute island at all,' sneered Crass.

'There's plenty of 'em about now, anyway,' sneered Crass.

'Oh, of course everybody's an idjit except you,' sneered Crass, who was beginning to feel rather fogged.

'Oh, you 'ave come, then,' sneered Crass.

''E don't know 'isself,' sneered Crass.

'Oh, of course, you think you know,' sneered Crass, 'and of course you think your opinion's right and everybody else's is wrong.'

'It's one thing to say it and another to prove it,' sneered Crass, who was anxious for an opportunity to produce the long-deferred Obscurer cutting.