The only thing I can think it could be some kind of culture clash Israeli have with… every other culture, somehow? Maybe all these action that make Sinwar look noble and heroic to most people look like something only a chump or loser would do to Israelis or something. That or Israelis have dehumanised Palestinians to the point where they don’t think they have any real agency and assume everyone else sees Palestinians that way.
I just can imagine being with someone that arrogant, how could you even stand talking to someone like that?