The US State Department described Israeli actions as “unacceptable” 87 times in 2014, with only three countries being more “unacceptable,” according to a Foreign Policy article published last week.
They did a search for “unacceptable” and various country names on the web site. The briefings on Israel-Palestine are done by the same people at the same time as those on Egypt, Syria, Iran, and other Middle Eastern countries, and information about all those countries appears in the same documents on the web.
So documents referencing unacceptable actions or situations in Egypt, Syria, Iran, and other countries turn up when you search for web pages which contain the words “Israel” and “unacceptable,” and that accounts for many of the hits you get with that search.
Also, the search turns up transcripts of briefings where reporters ask if a particular action or situation in Israel or Palestine or elsewhere is “unacceptable” and officials giving negative or non-committal responses. In other words, what I saw wasn’t a very systematic or serious survey or the available information.
I suppose it could still be that Israel is number four in unacceptability at the State Department, but the data one turns up with the search makes for some skepticism about that conclusion.