Hitting a baby pigman will not make it attack you, even though it plays the anger sound.
Either related or duplicate to MC-41839 as this issue will work without a pigman chicken jockey or with one.
Environment
HD5450
Core i7 3770k
Windows 8.1
MC-56744
Baby pigmen cannot attack
Resolved
Fixed
0
(Unassigned)
Unconfirmed
Minecraft 14w20b, Minecraft 14w21a, Minecraft 14w21b
Minecraft 14w25b
Retrieved
fixed in 14w25a