People are very allergic to acknowledging actual distinctions of interest and belief; but if you support the policies Gadi Eisenkot, Naftali Bennett, or Yair Lapid you are opposed to what Mamdani and his supporters believe in. Which is fine, it's a free country, but there's no point lying about it.
Alexalso, if your proposed alternative to protesting is to “make clear that we stand with Israelis like former IDF Chief of Staff Gadi Eisenkot, former prime ministers Naftali Bennett and Yair Lapid” who all oppose a Palestinian state, describing yourself as a liberal Zionist is just window dressing