why do muslims receive so much hate?

Politicians needed a justification for war and for over a decade the media drip fed the word Muslim in the same context of terrorism. That's the [b]only[/b] exposure people got to Muslims. So by dehumanising them in an excruciatingly long process, it slowly became second nature to see Muslims with reinforced stereotypes who exist as monolothic individuals. This was 100% intentional. It had a purpose and still does.
Anytime a specific group of people are demonised, more times than not there's an ulterior motive that's making a rich man even richer.

As for the masses of regular people, they prefer to ignore or dismiss it because anything that isn't in their frame of experience makes them acknowledge patterns they're uncomfortable addressing.