knock

[+ object] informal : to criticize (someone or something)

• He's always knocking the government.

stand for: phrasal verb

3 : to allow (something) to continue to happen — usually used in negative statements

• I will not stand for [=put up with] any more of this nonsense.

He wouldn't stand for no knockin' the place.

本句不是双重否定（double negation), 而是多重否定（multiple negation).

多重否定指二个或二个以上的否定词重叠使用却仍然表示否定意义的语法现象。

例如：

He didn't say nothing. 多重否定。

= He didn't say anything.

You've never seen nothing like it. 多重否定。

= You've never seen anything like it.

多重否定仅用于非标准英语（non-standard English), 常见于随常口语或小说的对话中。尽管为传统标准英语所不容，但在日常生活中却是常见的。

（以上蓝字部分摘自章振邦《新编高级英语语法》）