Who does don john not like?

You're likely referring to Don John from Shakespeare's play *Much Ado About Nothing*. He does not like:

* Claudio: Don John is envious of Claudio and his happiness with Hero. He schemes to break them apart out of spite.

* Hero: Don John dislikes Hero because she is loved by Claudio, the man he desires to see miserable.

* His brother, Don Pedro: Though they are brothers, Don John resents Don Pedro for his popularity and his good nature. He feels like Don Pedro overshadows him.

Don John's dislike for these characters stems from his own bitterness, jealousy, and desire for revenge.