They get angry if they think they are being treated disrespectfully.

如果他们认为被无礼对待，他们会恼怒。

《柯林斯英汉双解大词典》

We know that no one is perfect, but in my whole life I never heard you raise your voice at Grandma or treat her disrespectfully.

我们知道人无完人，但在我的一生中，我从未听到您对奶奶提高嗓门或对她无礼。

youdao

Does she treat your friends and family disrespectfully? Rudely?

她对你的朋友和家人不尊重吗？粗鲁吗？

youdao

The general and his aides spoke disrespectfully about several administration officials.

VOA: special.2010.06.26

Lena Horne refused to play roles that represented African-Americans disrespectfully.

VOA: special.2010.05.23

People who feel that they have been treated disrespectfully are more likely to develop hostile reactions, possibly including cyber-abuse.

FORBES: The Evil Twin: Learning From Insider Security Threats

And the chairman said both United and Liverpool, who reportedly want to sign Spurs captain Robbie Keane, had behaved disrespectfully.

BBC: Ferguson 'embarrassed' for Spurs

"Innocent people who are stopped can be treated disrespectfully, " he said, noting that the police department has begun instituting polices to fix the problem.

WSJ: Silent Treatment for NYPD