This leads me to think you're more ENFP. No ENTP I know, not one, has difficulty giving criticism, which results in many debates and fights that could have easily been avoided. On the other hand, the ENFPs tend to be concerned about how their words will be received.
Actually, I do find it hard sometimes to give criticism - only easier when it's people I know well, who I know will not think it comes with malice. However, I have experienced many times, NF's
thinking I'm criticizing when I'm actually not, taking things personally and seeing malice in them that isn't there in reality... A
suggestion of maybe "if we tried it another way, it might be quicker" can very easily be taken by a touchy NF as "your way is stupid, I think you're stupid and we should do it my way", which is 100% in their head.
With regard to the "lower temperature" of coldness that F's can muster, I concur. That whole "lock and load" door slam thing that so many NF's do - I just wouldn't be capable of it. No matter how pissed I am at somebody, deep down I always
want to resolve the situation and be friends again, and that will always undermine any intention I have of giving them the silent/frosty treatment that I can never carry out in reality. If I can see someone's trying to make amends, even if I suspect it might be insincere, I can't help myself at least giving them a chance to explain and if they tell me their side of the story and it seems I got them wrong, I do immediately relent and forget all about it, whilst I've known many NF's who will just hold a grudge forever and never relent even if an angel comes down from heaven and declares you innocent!