The “you mad bro” is found among internal Valve communication (Valve COO Scott Lynch to Erik Johnson and Newell, i.e. in the sense Johnson/Newell being “mad”, not Sweeney). It was particularly not sent out as a response to Sweeney. Another outlet already got tripped over this and had to make a correction: https://www.gamingonlinux.com/2024/03/valve-coo-on-epics-tim-sweeney-you-mad-bro-when-launching-the-epic-store/
This is not quite as sensational as some people are framing it.
Yes. But one should also note that only a limited range of Intel GPU support SR-IOV.
See https://knowyourmeme.com/memes/u-mad, in particular the “Due to the agitating nature of the phrase, it is often considered a form of trolling.”