It's disingenuous to say it is supported by the US. If the US is "supporting it", so is France, UK, Italy, and Spain.
We also have some odd policies regarding SA - the recent transfer of ownership of the UK Football (Soccer) club Newcastle United is shrouded in mystery because the UK government granted special secrecy to the incoming Saudi owners. No, this is not fiction.
There's a whole history of unpopular decisions regarding SA, and the wider UAE in general, in the UK. Many times trade (notably arms) sanctions have been called for and routinely ignored. E.g. when the tragic living and working (read: slave) conditions of much of the immigrant workforces were revealed.
Whataboutism would instead say something like: Well France is supporting it too, why are you focusing so much on the U.S.?
The overthrow of Yemeni President Ali Abdullah Saleh by Obama which was the first step to destroy Yemen:
https://www.nytimes.com/2011/04/04/world/middleeast/04yemen....
We're talking the same Obama who got a Nobel peace prize, right?
https://en.m.wikipedia.org/wiki/The_Trial_of_Henry_Kissinger
The same Kissinger that the Clintons embraced:
https://www.vox.com/world/2016/2/12/10979304/clinton-sanders...
Kissinger continued to violate the signed truce after being awarded the Nobel.
[0] https://www.independent.co.uk/news/world/middle-east/nobel-p...
Obama is commander-in-chief of the US military and therefore ultimately responsible for the AC-130 gunship that repeatedly bombed and strafed a field hospital in Kunduz, Afghanistan, a week ago.
Weirdly, the aircraft was almost certainly using a 40mm cannon made by Bofors, a company that was once owned by Alfred Nobel, the founder of the peace prize.
Two dozen people were killed, including three children. Among the adults were the staff and patients of the charity that runs the hospital, Médecins Sans Frontières. Doctors Without Borders, as it is also known, was given the Nobel in 1999 for its “pioneering humanitarian work on several continents”.
So a Nobel Peace Prize-winning President is being condemned for sending a gunship to kill the staff of a Nobel Peace Prize-winning charity using weapons made by the company that the founder of the Nobel Peace Prize used to own.