The poster is most likely referring to laws like those in Florida Gov. Ron DeSantis's "anti-riot" bill, which was passed but eventually found unconstitutional. It gave civil protection to anyone who ran over protesters with a vehicle. Oklahoma Gov. Kevin Stitt also signed such a bill, House Bill 1674 in 2021, which says that people who run over protesters if they "feel threatened" can't be held civilly or criminally liable. North Dakota (HB 1203), North Carolina (HB 330), Florida, Tennessee, Rhode Island, and Texas also proposed similar bills. It is worth noting that several of the bills do say that if a driver wilfully runs over a protester, it's not ok, though language varies.
Can you cite a source on this I've never heard anything like this.