I'll reassure you! I do not see that kind of behavior from an ESTj at alllll. My ESTj friend is ultra respectful/sesitive of others triumphs. In fact, she's the one that receives the kind of negativity you are speaking about. She got that from an ISTj. The ISTj roomate would always measure herself up against my friend.
It irritated the crap out of my friend.
I've seen my friend get competitive, but never to the point of directly/verbally/intentionally sabotaging people. If they earned it, she is thrilled for them. Now, if they CHEATED or somehow CHARMED their way to a win, ohhh, watch out, her fury would come through.
But it was FURY. It wasn't sly and manipulative like you are describing.