This is by far the most persistent piece of misinformation about EVs. In the US in 2020, on average, EVs co2 emissions corresponded to an average ICE vehicle that got 91mph. On the highest carbon intensity (ie dirtiest) grid in the country that figure was 44mph in SERC Midwest. The best was in upstate NY at 246mph. So, even in the worst case when driving like vehicles its a lot cleaner to drive an EV. It is true that the dirtier the grid the longer it takes to overcome the higher manufacturing emissions.

The Union of Concerned Scientists had a study which shows the math on all this. Of course these are the 2020 numbers so everything is better now than it was then.

https://www.ucsusa.org/resources/driving-cleaner

https://www.epa.gov/egrid/power-profiler#/SRMW