“At one point someone said that we shouldn’t support BDS at a time of increasing antisemitism, and there was a big groan. That made it feel very uncomfortable.
“There was also lots of whooping and cheering after the vote and I’ve had lots of students - about 10 so far - come to me complaining.
“Of course I’m worried. We shouldn’t have a situation where students feel uncomfortable; it's terrible. I’ve been working hard today and will continue to work hard to make sure Jewish students feel welcome in Oxford.”
He added he would record the university delegates’ votes and report them back to the OUSU.
The OUSU voted against joining the BDS movement in 2013.
The news comes as more than 1,000 people have signed a petition asking Southampton University to cancel a conference in April where experts “will diagnose the legal position with regard to the nature of Israel”.