You know I never thought I throw 'heart grenades' at people -- though I do yell a lot at my ISTJ friend for being so harsh in general but since we're long time friends it's partly in jest and we both purposely poke at each other sometimes. I don't beat around the bush or plead with people either, if I don't like the way you are coming at me with your criticism, I'll let you know pretty directly and probably suggest a more CzeCze conducive mode of speaking with me.
Overall, I don't think I make people walk on eggshells around me. In fact, I make an effort to be the opposite and my friends and acquaintances and people I date or otherwise "am involved with" (ahem) tell me I'm quite honest and in a refreshing way. Even my humor is somewhat shocking, because I guess ENFPs are somewhat exhibitionist. In terms of criticism, I couple my honesty with consideration and tact and I really think that's the most efficient and effective way to run things. Be honest but think about the other person and the situation when you present your case.
As for 'dont' hurt me, I can't take it' I don't think this is the image I project nor do I care to. I found out long ago that this has the opposite or NO effect and you will be eaten alive (remember highschool people??? and at work telling people to be nice to you doesn't work, it gets you fired). Acquaintances, friends, and family have told me the opposite and that I put out the impression that I'm tough and independent and specifically (importat distinction) I want the world to know that I'm tough.
Also, I'm somewhat of a raging lesbian feminist, so this kind of "I'm weak, don't hurt me" image really runs completely counter to the very fiber of my political and personal beliefs. Even if I were to get all yogic hippie metaphysical on you I'd say "I am strong because I acknowledge my humanity and weakness" is the closest thing to "don't give me the truth, I can't handle it" that I will ever openly admit. Don't infantalize me or humor me, I can take it.
Sometimes, can I seriously NOT handle criticism? For sure. When I feel I have no choice but to swallow someone else's critique et. al. with no clue how to 'improve' or have a chance to defend myself. Case in point: my last corporate boss who never had enough time for me and basically just seemed PISSED and disappointed or extremely short when she critiqued me but never gave me any tips or ways to improve.
And I just want to add, there IS a difference between criticism and fighting words and hurtful intent. So sometimes if someone is balking at criticism, it's not that they are and total wuss with no hope in hell, but that they really are accurately pointing out someone's true agenda which is not very nice or constructive. And if you can't tell the difference or understand WHY someone is trying to critique you, I can see how a sensitive person would not want to hear it.
Just like it's possible for someone to use "don't hurt me, I'm fragile" to avoid dealing with reality (because honestly, I know we're talking about "criticism" here, but we're really talking about life et. al.) it's quite common for people to use "I'm just telling the rational truth or giving you my opinion (so stop being a fucking wuss and take it like a man!)" as a shield for being jerks. Sure there may be some TRUTH or 'rational thought' behind the criticism but if the intent is practically or totally to hurt someone or 'get payback' for an imagined sleight, you can't really fault the other person for not wanting to accept your thoughtful gift.