バカにする

ばかにする
expression
to make fun of, to mock, to look down on
1. to make fun of, to mock, to belittle
To treat someone or something as foolish or unworthy of respect; to ridicule or look down on.
バカにするな!
Don't make fun of me!
(ひと)をバカにした態度(たいど)
An attitude that looks down on people.
バカにされて(くや)しい。
It's frustrating to be made fun of.
バカにしないでちゃんと()いてよ。
Stop mocking me and listen properly.

バカにする is a common casual expression meaning to mock or belittle someone. It's quite direct and can be offensive when used seriously.

Variations:

  • 馬鹿(ばか)にする (kanji form - less common in casual use)
  • ()バカにする (to subtly mock)

Related expressions:

  • 見下(みくだ)す (to look down on - more literary)
  • なめる (to underestimate/disrespect - slang)
  • からかう (to tease - lighter tone)

"バカにするな!" is a very common angry response when someone feels disrespected.