Unhealthy/average IEIs (common, because dirt will always be more common than diamonds): These IEIs will let others be walked over in real life. They will be incredibly selfish, and emo and negative self-inflicted, and will only rant about their social justice issues on online or in their own journals, where nobody gives a shit and they can't actually effect anything. They will live a very disturbing fantasy life, and they'll never try to make their ideals into a reality, they will just wallow in the realm of imagination with no grounding core. Incredibly neurotic. Will say 'oh it's a fantasy it's not real' even if it might actually be a good idea.
Personality disorders: Narcissism, social phobia, antisocial personality
Healthy/well-adjusted IEIs (rare): These IEIs will confidently and proudly state what they believe in to other people in real life, and won't just play 'mediator' with everybody. They will lose their 'nice guy' mask. They will be much more directive about what it is they really want to do, whatever it is, they're not going to be such a 'sponge' for everybody else's desires, and still- they won't refuse a desire just to be difficult or just because 'they can' and get away with it because they know how to be quiet and low-key. If they see somebody getting bullied or picked on, they will say something about it instead of letting everything fester. And they'll also be a lot more active about their art, and what it is they're doing. They will also quickly realize that, everybody has felt what they're feeling at that time, just probably not as deep or pure.
IEIs are one of the purest types- so when IEIs are bad, they are BAD- the worst fucked up people are IEIs and have a host of psychological disorders, but when IEIs are good, they are pretty much Gods. An imbalanced/balanced ENTj for example, is simply much less extreme.