4 sentences

1. 这种行为简直是自欺欺人。

   zhè zhǒng xíng​wéi jiǎn​zhí shì zì qī qī​rén.

   This behavior is simply deceiving oneself and others.

   Source: Dong Chinese Dictionary

2. 欺人太甚。

   qī​rén tài shèn.

   This is going too far.

   Source: Dong Chinese Dictionary

3. 他仗着家里有权有势，整天在外倚势欺人。

   tā zhàng zhe jiā​lǐ yǒu quán yǒu shì, zhěng​tiān zài wài yǐ shì qī​rén.

   Relying on his family's power and influence, he bullies people all day long.

   Source: Dong Chinese Dictionary

4. 有些人仗势欺人在这一带横行霸道，引起了公愤。

   yǒu​xiē rén zhàng shì qī​rén zài zhè yī​dài héng​xíng​bà​dào, yǐn​qǐ le gōng​fèn.

   Some people who use their power to bully others have been running amok in this area, causing public outrage.

   Source: Dong Chinese Dictionary