Oh i definately have issues with people viewing me as something i do not identify with. I can be quite affected too, and others will be slightly taken aback by this. I am working on that though because I realise that I am responsible for my own reactions and that I shouldn't rely others to bolster my beliefs about myself... inner conviction.

ENTP's being vengeful? highly possible. Maybe though, try to work out the impact it has/is having on you and why... work on that part. If the person is having a negative effect on you make changes, boundaries... some for you too, possibly.