I think saying "evil" anything is wrong. But the UN is still a body made up of people, and like everything has its flaws. Its done some things that have turned out great and truly made the world a better place. Its done other things that haven't worked out so well. I certainly don't think it is above criticism.
I can understand why Israelis might be suspicious of the UN. The relationship between UN and Israel seems kind of fraught in a way that isn't true of pretty much any other country. The not allowing israel to fully vote until 2010 (edit: 2014), the (arguably) unequal focus only Israel's human rights record relative to other countries, and the whole UNRWA being totally different with different rules than any other refugee group, all make israel a bit unique in its relationship to the UN. I could easily understand how someone from Israel might feel that the UN treats them differently from other countries and is perhaps biased against them.
Two thoughts on this:
Firstly, every time a country is getting criticized for it's human rights abuses it, like clockwork, raises the spectre of being "unjustly singled out" about it's human rights abuses. To be clear, I would very much like every country on earth that engages in human rights abuses prosecuted for it, including mine, and specifically every U.S. President that's still currently alive since they are ALL guilty of them in varying degrees. And that way, we can't be accused of biases.
Secondly, I believe it's fair, even if we are biased against Israel in this way, to be biased since it has the rather unique position of being a state that exists solely because of and by the authority of the West. It is a colonialist project and has been from it's inception and I don't think you can take this situation on fully without acknowledging that fact.
Debating whether it should or shouldn't exist is rather moot at this point because it does, and tons of people live there who have committed no crime and done no wrong. That said, it is at the end all, an ethno-nationalist state built on a foundation of war crimes too numerous to count, that is currently incrementing as they barrage an utterly impotent neighbor to death, and it is doing so with the enthusiastic encouragement of FAR, FAR too many colonial powers. Maybe that's enough to say, ethically, that all of it's citizens should be displaced, maybe not. I do not know the solution. My point is that Israel's existence, in entirety, is violence perpetrated against every country it borders with, it wars with, and who's land it sits upon. That cannot be ignored.
You're not going to throw that out without reference to how the US and Israel have consistently been the only countries to oppose Palestinian UN membership and voting.
E.g. they have done a lot of good work reducing hunger & famine throughout the world. UNESCO has done a lot to preserve unique cultural & envirnomental sites around the world. UN has done a lot to put pressure on countries to ban female genital mutilation.
https://www.europarl.europa.eu/doceo/document/E-9-2023-00193...
"The appointment of Ali Bahreini, Ambassador of the Islamic Republic of Iran and Permanent Representative to the United Nations, to chair the 2023 United Nations Human Rights Council (UNHRC) Social Forum (2 and 3 November 2023), is nothing more than a slap in the face given the human rights situation of most Iranians, particularly women, and the repeated executions in the wake of the ongoing protests in the country and, more generally, the Islamic Republic's gross human rights violations and its catastrophic and politicised handling of the COVID-19 pandemic, when its refusal to import Western vaccines cost hundreds of thousands of lives."