Why are you so rude to your mother?

你为什么对你的母亲这么没礼貌？

《牛津词典》

I find it astonishing that he should be so rude to you.

他竟然对你这样无礼，真叫我吃惊。

《牛津词典》

He said that I'd been so rude to him when I left that he would never employ me again.

他说我离开的时候对他太粗鲁了，他再也不会雇用我了。

youdao

She said it had been difficult trying to reproduce the new album live because "it's so intimate in some respects and then so rude in other respects".

BBC: NEWS | UK | Wales | 'Right time' for Cerys' comeback

It's like when someone sends you a perfectly nice e-mail but you're in a bad mood so it appears rude.

BBC: Why are round-robin letters so annoying?

It seems so fast and rude for an old-fashioned guy.

WSJ: Peyton Manning, Sad but Single