INTPs--You Need To Work On Honesty
Anybody, of any MBTi type, can take advantage of you, or lie, or harm you personally.
With that out of the way, I want to talk specifically about a problem I have observed from one type: INTP's. I've known 3 very closely--one as a good friend, and the other 2 as roommates.
INTPs are tempted to lie. Lie a lot. Scratch that--they are tempted to lie so obscenely it would make the devil blush. About anything and everything, daily.
First INTP: This one, when I first met him, told me he worked at a hospital for suicidal children. I was very touched. Several months later, I brought it up in front of a group, and he says, flatly, "Oh, that was a lie." HUH? You lied about something so important and unnecessary to make yourself look good in front of your peers (Fe)? He was a 40 year old man who had lived in his mother's basement his entire life, and was very embarrassed about his lack of accomplishments.
Second INTP: This one lied and cheated whenever we played board and card games. He was excellent at strategy, but boy oh boy did he try to pull a couple fast ones on me. Once, he played a Super Star Destroyer on the first turn of a popular Star Wars card game we were playing. That card's cost was 8. I looked at the 3 cards he had to have in his hand in order to play that, and it was greater than 1 in a million chance. I called him out on it and...it was weird. He kind of acted upset, went to his room. And then never brought it up again.
Most people would be mortified to be accused of cheating--he was not.
Third INTP: This was the one that prompted me to make this list. I met her at an Airbnb and she immediately dove into this unimaginable story with details that made zero sense. She claimed she was beaten up by a partner the previous month and got a surgery for hematoma--but her hair was long and I didn't see a single scar on her skull. She claimed she was poor and needed money for food--while at the same time claiming her dirty German Sheperd with an overgrown coat was worth $100,000, and that she, a marketing director, made 6 figures a year. I asked her what her thoughts were on A/B marketing (that's a technique where you experiment with 2 marketing approaches, and see which one makes more money, basic Marketing 101 stuff), and she froze. I pressed her again and she said, "Oh, I don't do that lower stuff. I'm above that." But she had the entire Airbnb fooled (about 6 other guests).
The best thing I have discovered for immature INTP's that lie is to: call them out. I know it's hard to do and it seems risky, but I have come to the conclusion that they will respect you more, and take little offense by it. Social norms like honesty (Fe) puzzle them, and their Ne-Ti combo makes it so easy for them to generate stories and excuses on the fly. In fact, I think they see it as a game.
Otherwise, I really like them a lot. They have so many awesome insights into many things.