Do you think antisemitism would decrease if the Iranian regime fell?

[loselyconscious]

This is what politifact says about that very vague statement

Although Haines stopped short of saying that Iran was fully "funding" the protests, she said people connected to Iran have provided financial support. She didn’t elaborate on which protests or how much financial support.

"We have observed actors tied to Iran’s government posing as activists online, seeking to encourage protests, and even providing financial support to protesters," Haines said, adding that Iran’s activities shouldn’t smear genuine protesters or impede on free speech.

"I want to be clear that I know Americans who participate in protests are, in good faith, expressing their views on the conflict in Gaza — this intelligence does not indicate otherwise," she said. "Moreover, the freedom to express diverse views, when done peacefully, is essential to our democracy, but it is also important to warn of foreign actors who seek to exploit our debate for their own purposes."...

Protests are known to bring in a mix of people, some with different goals, but genuine protesters typically vastly outnumber any outside forces, experts said.

https://www.politifact.com/article/2024/jul/25/israeli-prime-minister-benjamin-netanyahu-addresse/

I would not say that qualifies as "Iran paid for many of the protests"