Where I'm located I'm billed $.07 per kwh. My model 3 LR has a 75 kw battery, so to charge it from totally empty to totally full would cost $5.25. Tesla's claims are a bit inflated, but I can get 300 miles on a full charge, putting the cost to drive 100 miles at $1.75. Even if we took an extremely generous approximate of 50mpg, it would take 2 gallons for an ICE vehicle to travel 100 miles. Where I'm located, gas is going for $4 a gallon, so it would cost $8.00 to travel the same 100 miles in an ICE vehicle.
If you're charging at home, the EV easily wins.
However, charging away from home can get expensive. During peak hours, it's possible to find charging for $.50 per kwh. Now it would cost $37.50 or $12.50 to drive 100 miles. Compared to the $8.00 in the ICE car, the EV is more expensive.
I think it's a bit disingenuous to claim that most cars cost more to charge than to fill up with gas. If you are able to charge at home, EVs are cheaper to drive per mile.