"Between 2009-14 everything was my fault but as of the last 4 months nothing is @MehboobaMufti's fault (sic)," Omar wrote on Twitter.
Omar was referring to the criticism he was subjected to by Mehbooba when he was the Chief Minister and she was the leader of opposition.
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Mehbooba, who made her maiden speech at an Independence Day function as chief minister, said, "Encounters have taken place in the past, will continue to take place. What was my government's fault?"
Omar created a hashtag "living in denial" to go with his tweets.
In another tweet, Omar said Mehbooba will have to find someone to blame for failing to hoist the national flag at the Independence Day function on Monday.
He was referring to the national tricolor falling off the post as Mehbooba hoisted it at Bakshi stadium here where the main Independence Day function of the state was held.
Mehbooba pulled the string attached to the post only to see the tricolor fall from the post and land on the ground.
"Now Mehbooba will have to find someone to blame for failing to hoist the tricolour in Srinagar since nothing is ever her fault," he said.