Zombie Pigmans Always Mad.

Zombie Pigmans are Always Mad. 

 

Things i tried:

 

Getting Killed by Pigmans

Killing Pigmans

Running so far away they dispawn/ The Aggro Timer runs out.

Problem started when i first got into the Nether, Zombie Pigmans instantly started hating me. 
Only Spawn area Pigman seem to have Aggro