It's not anti-semitic to speak against Israel. It is, however, anti-semitic when zionists suggest that it is, since many, many jews are not zionists and do not support Israel.
So Dems who speak against the genocide might be called anti-semitic by the far-right, but it's simply not true. We should not be basing our politics on the lies that someone might say about us. Instead we should call them liars.