Best part of using the feature is seeing people seemingly arguing with themselves, then remembering you've basically evaded the troll bait.
These people debate in bad faith, just wasting your time and energy, and they're just trying to distract from not having anything to truly contribute to the conversation.
Nobody can see your ignore list, and nobody's keeping track of wins and losses based upon that.
Don't fall for the reverse psychology of it, they just want attention, even at the cost of whatever little dignity they have.