There are polls out that claim most Americans under 30 believe the USA shouldn't be supporting Israel. And that's a very vague, and non-specific way to ask that question.
8 years ago if you talked about this on Youtube, Twitter, etc. you'd be immediately met with claims of antisemitism, and labeled a conspiracy-tard.
But over the past 2 years I think is where I saw things really start change online, and that an also be deceiving because we end up in these echo chambers, but I am seeing this talked about by regular people in mainstream venues now.

There's a theory that Charlie's clip-on microphone detonated or fired a projectile into his neck, and why is that?
Oh because a couple months ago Israel proudly showed the world how they detonated pagers and cell-phones on people they claimed were terrorists.
Then Netanyahu gave Trump a golden pager or cell-phone to "commemorate Israel inventing the cell phone"; which they absolutely did not invent. I don't even know why they would make a claim that's demonstrably false.

If you listen to former CIA agents talk about dealing with Mossad and intel from there they talk about how little they trust them, and how they always leave spy devices behind when they visit the embassies or other buildings. They harass our intel officers and ambassadors in their country as well.
It doesn't sound like an ally at all.
But then the USA has done other things to our allies that aren't quite as bad, but it's the same principle I guess.