Growing up, my father worked for the UN, which sent him all across the globe. He lived in Israel for 4 years and various places through in the Middle East including Syria & Jordan. I can’t speak on Syria and Jordan, as I’ve only visited one of those places, but he used to always tell me that Palestine are alone in this conflict. That they were surrounded by the enemy, literally. This was in the early 80’s. I didn’t know it at the time but later on I realized he was telling me that Arabs don't fuck with them enough to lend a hand.
Fast forward to adulthood, while I can’t speak on Syria & Jordan, I can DEFINITELY speak on Egypt. I brought up the conflict once at a restaurant as Israel were playing Jordan in a friendly match, and I almost wished I hadn’t. My thinking was that,
“why can’t a country as fully equipped as Egypt, or Saudi Arabia to the right, stand up for Palestine and help them in their time of need? You know, as Muslim brotherhood…” The entire room turned to us and got in on the discourse. The general consensus in the room was that this entire conflict was actually Palestinian’s fault and that they don’t believe they want or care for peace.

I was floored cause you wanna talk about victim shaming! That they’re happy to be victims to Israel and are playing martyr to the rest of the world. I immediately thought of my pops at that time and knew he was right.
While it may feel anecdotal, I received this same viewpoint in other parts of Egypt, both lower and upper and a few other times, it came from Jordanian & Saudi nationals themselves. The vibe I get which pertains to Palestinians is that of scorn, where they view them as the
“you got, got..” types, and if you know a little about Islamic culture, that’s a massive no no.
While of course, it’s not ALL Arabs that hate them across the board, there is a pretty large underlying resentment towards Palestinians for not doing what they need to do and allowing Israel to stick it up their backsides. That scorn is enough to make many Arabs turn a blind eye in their personal lives.
Publicly, en masse, looks a bit different.