Iron Golems Not Attacking Me

In survival mode, If I were to hit an iron Golem, instead of it attacking me it just ignores me and carry on.

Steps to reproduce:

1. (Make sure your not at a Village nearby)
2. Summon an Iron Golem
3. Make sure the difficulty isn't peaceful
4. Hit or Shoot the Iron Golem

Observed Result: The Iron Golem doesn't fight back

 

Expected Result: The Iron Golem should fight back

 

The radius to shoot the Iron Golem away is ? (I'm having issues finding out what the raidus is, if you know what it is please comment it down)