system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:Why is Israel pissed off with the Iran Nuke deal?

I would think that a deal saying Iran can't produce a nuclear weapon would be something Israel would be all for, but yet they seem pretty upset about it.
gpt
As with almost all foreign policy pronouncements, you should consider what audience is being targeted and what the speaker's incentives are.  In this case, there are good strategic incentives for Israel/Netanyahu to appear hardline on this deal.

First, Netanyahu's domestic political situation is dependent on him being seen as hardline on Iran.  He has staked his reputation on this position and so, *whatever deal was agreed to*, he has to appear more hardline than that.  So, even if he actually thinks that this is a good deal, or a step along the way to a good deal (good in terms of what Iran would eventually accept), he has to publicly appear "pissed off", using OP's language.  

Second, there is the international audience.  The P5+1 negotiators (from the United States, Britain, China, Russia, France and Germany) will be able to get a better deal from Iran if they can point to a hardline Israel stance and say to Iran, "Look, look at the pressure we are under here.  If you don't want Israel to reject the deal (and maybe unilaterally bomb your nuclear facilities), you are going to have to give a better deal".  The P5+1 negotiators also seem more reasonable and moderate next to a hardline Israel.  

In addition to strategic incentives, there is a thing called "fundamental attribution error".  Briefly, this is a psychological phenomenon that all humans are subject to to some extent, where you think that you are a good person and forced to do bad things by your environment, but other people do bad things because they are bad people.  So, even though Israelis trust themselves to only use their nuclear weapons defensively, they think that Iran would use nuclear weapons offensively, even if that means effectively committing suicide (through nuclear retaliation).  This means that they are far more concerned about *ensuring* Iran doesn't have nuclear weapon capabilities than is reasonable/rational.  

These are the most basic and plausible explanations for why Israel is pissed off with the Iran Nuke deal.  There are other possibilities but they are more complicated.