Blaze fireball angers Zombie Pigmen towards player

I was playing survival and gathering blaze rods in the nether like anyone else does, and there were a lot of blazes shooting fireballs everywhere. Suddenly, one of the wandering pigmen gets shot by a blaze's fireball and then before I know it I'm being chased down a corridor by several pigmen, forcing me to log out of my realm that I rented. I'm not sure if this is actually a bug or not but I don't think anyone wants to be punished by pigmen for something as ridiculous as a blaze shooting a pigman.