Interestingly, Vreeland is apparently an Israel-hater as well as a Bolton-hater, according to Powerline's analysis of an article Vreeland published in the International Herald Tribune in 2003 (thanks to LittleGreenFootballs for the link):
So Frederick Vreeland's opposition to Bolton, which is being promoted as a non-partisan critique by a "former colleague," throws the issue of Bolton's nomination into stark relief. John Bolton stands for a certain set of opinons and values, which mirror those of President Bush: he doesn't think America is to blame for terrorist attacks; he doesn't think the U.N. is morally superior to the U.S.; he thinks the job of an American diplomat is to advance the interests of the United States, not other countries; and he sees neither virtue nor advantage in treachery toward American allies, especially Israel. Bolton's enemies hate him because of these values and opinions, not because he lacks the suave manners of the State Department clique that, for decades, has gotten everything wrong about the Middle East.