I would also add that the America First movement is nothing new. Historically it was an organization that supported Hitler and anti-semitism and rejected U.S. fighting the Nazis. Fuck Israel of course, but in a way that actually addresses the problem.
“america first” is a nazi dog whistle so it is likely that the owner of the sign is antisemitic; however, criticizing israel’s government, as many antizionists do, is not antisemitic. zionism and judaism are not the same, zionism is weaponized judaism