I genuinely don't think "Arabs were doing some really important work a thousand years ago" is a good rebuttal to RFK's racism. Tawakkol Karman won the Nobel Peace Prize in 2011. Omar M. Yaghi won the Nobel Prize for Chemistry in 2005. Maryam Mirzakhani won the Fields Medal in 1977.
RFK jr is an asshole (but we already knew that). Moreover, he's wrong. Why is algebra called that? Who gave us the digit 0 (zero)? And our current number system? Why is the star Betelgeuse called that, for that matter? And so on.