Think you dont know them then. They often use sarcasm or irony to convey an idea and they measure the standpoint of their partner in discussion by examining how he reacts to the idea. This's probably not the nicest way but you learn a lot about the other persons personality, where he stands in life and what experiences he has gathered so far. By only reacting to some simple questions, the other person draws you a big picture that gets filled with information in an instant. Information you basically only feel and that you'ld need time for to express in real words. It's not like this the last image you'ld trust about a person then, but generally your first gut feeling is right and you can always trust it.
That in combination with a more misanthrophic view of the world, maybe is the needed security shield you could have to ward yourself against 99% of all bad things. Only thing you'ld have to give away for that is a lot of emotion involved, you'ld basically need to be in control of the situation and it would take you a phlegmatic eternity to show some feelings at all at some point. The good side of this thing but is, you learn a lot about the universe and you are basically caught in a big situation of ideas everytime which lets you think about even the most dumb and evil people, "ok he has something inside of him".
The sad side is, tho the entp would have some kind of life wisdom, since he has been peaking thru the key hole for all his life, he is never taken seriously on the contrary, it's rather the case that he is hunted down. The people with the baddest imagination, which are those you really need to talk clearly to in a discussion all the time, as in boring and which virtually have zero sense for recognizing a joke are kinda the easiest ones to manipulate. These are those people who have their hearts on their tongue and you'ld only need to project an aura of seriousness and you can make them do anything you want.
So in essence, wouldnt it be good for everyone to become a little bit entp, to ward himself against evil influence, by putting value into abstract conversations, which do not involve to much reality in the first place. Or by testing the other persons intelligence and therefore keeping your own independence, if you tell him one thing ironically to then see how he reacts and to see how much he knows you already ?
Dont you think the lack of fantasy is the death to everything ? I do not understand why one always needs to be dead serious when he talks about emotions