Working definition: “Antisemitism is a certain perception of Jews, which may be expressed as hatred toward Jews. Rhetorical and physical manifestations of antisemitism are directed toward Jewish or non-Jewish individuals and/or their property, toward Jewish community institutions and religious facilities.”
Denying the Jewish people their right to self-determination, e.g., by claiming that the existence of a State of Israel is a racist endeavor.
Perhaps, as many anti-Zionists argue, Israel was a mistake, perhaps, as they say, it was always the wrong answer to European and Christian antisemitism (even if there had never been any Palestinians living in the land before the late 1940s). And there were many forms of Zionism besides the political one that led to the founding of the nation state.
Other manifestations of anti-Muslim prejudice or hatred could take the form of insults or attacks against Islam, as a means of caricaturing, dehumanizing and promoting hate towards Muslims. However, each case is specific and the context of the individual or organisation making such comments should be taken into account when making such a judgement. Context, past comments – whether overt and street based or on-line, will be factors that should help to assist in making the judgement. Other expressions may take the form of visual graphics, actions, stereotypical statements and alleged character traits that are based on negative perceptions of Muslims and sometimes of Islam itself.