They dont let me get close. I've always found most people easy. Throw some kindness and charm and Fi their way and they are likely to melt. And i can see the extent they have melted.
ISTp's aren't like that. I always wonder if the two ISTp's i know even like me. I have no idea how much they like me. I get the impression they think im "ok". lol. One of them is like an ice cold rock. He rings me occasionally and askes me to come over. So that means he thinks im ok. But we wont really let me in. My old friend is hot and cold with me. Sometimes he does open up emotionally. Other times i think hes ready to tell me to fuck myself. I have met a third ISTp who seems to be more friendly to me though.
Even though that sounds strange and not bragging, I think it works in their favour. It keeps me guessing.