So, in all fairness: the anti-semitism debate is a minefield. There really is a genuine, vile undercurrent of actual anti-semitism in leftist as well as right-wing discourse. OTOH, it's also true that "anti-semite" has often been abused by pro-Israel activists and lobbyists in pretty much the same way as "transphobe" has been used by TRAs, i.e. in order to paint anyone opposing their position as a bigot. Or, if you happen to be partially Jewish (like myself), you're branded a "self-hating Jew" for insisting that the Occupation is fundamentally wrong and that past (or even present, in some cases) victimhood doesn't grant automatic immunity from the perpetrator label. And then again, some individuals (such as the aforementioned Atzmon) are genuinely insane, vile and insufferable in equal measure despite being more Jewish than e.g. myself.
Personally, I think it's pretty pointless to try and conflate the issues on this one - somewhat ironically because they're just a tad too similar: both the anti-semitism debate and the trans one happen to suffer from dedicated supporters of a cause trying to muddy the waters between actual bigotry, which must be condemned, and outrage over others daring to disagree.
It is no more anti-semitic to assert that the Israeli treatment of Palestinians is morally wrong than it is transphobic to insist that individuals with a penis are male. At the same time, both the claim that Israeli policy is being driven by a Jewish desire to achieve world domination and the notion that trans people are unnatural freaks are genuinely bigoted and should be opposed as such.
Somewhat confusingly, some of the very same people who get it generally right on the question of Israeli policy and, as a result, tend to be a tad too unfortunately tolerant towards those whose motives may not be entirely grounded in human rights are also the people who seem to be taking the line that "TWAW and if you disagree GDIAF, TERF" line. After about three drinks, I start to see the funny aspect.