Conveniently, Israel treats all Palestinians as if they were Hamas militants (who themselves are a resistance group resisting modern settler colonialism). Hamas is a convenient reason for them to ethnically cleanse a whole people. How is that difficult to see as the wrong side?
You can't just handwave Israel committing atrocity after atrocity after (but especially prior to) October 7th. It isn't that difficult to see which side is the wrong side for anyone with a couple brain cells and a functioning moral compass. Colonialism was terrible in the past and it is terrible in the present. Genocide and apartheid are bad for anyone who are not racists. Pretty easy line there.
edit: also the person I responded to poorly defends Israel in every thread and regularly uses bad faith argumentative tactics to spin out more propaganda. That is partially why I felt the need to respond.