In any version of 1.8, when you hit another player equipped with armor, their armor doesn't flash red. The player himself still turns red, but the armor doesn't at all. I just found out that this was a change added in the 1.8 Snapshot 14w05a, but it makes PvP much harder. It is extremely nice that the armor turns red in 1.7 because you can see a player taking damage much clearer.
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Probably intended. It makes sense, the armor isn't part of the player, it's a separate object. Probably caused by the fix of MC-46560.
Erik Broes
I think this might have been an intended feature change, but it definitely has a negative impact on many PvP gamemodes. Would be good if this could be reverted to how it was before.