Patch notes from August 31, 2018 state:
[quote]Made AI more likely to attack players that have damage reflection
It was still too hard to get AI to attack characters with reflection, which made it an aggro reducing stat instead of an offensive one. So we are now making this type of enemy more interesting to the AI.[/quote]
It appears to be worse now. Put a warfare toon with retribution of 1 in the middle of a pack, throw taunt, and watch every taunted enemy flee to the lowest armor character instead. Peeper's chickens at the cockerel is a great example.