Some people think speaking ill of those more or less religious than them is muttar.
This is a myth, and no-one is allowed to attack a Jew for his believes or/& conviction to observe Yom ha’Atzmaut &/or Yom Yerusholayim.
However, when someone is “Yotzo MiKellal Amisecho” they don’t enjoy the perks of being a Fellow Jew. Someone who socializes with Arab Leaders [including someone dressed as a Chareidi Jew} has alienated himself from the true genuine Jewish flock.