Not in my experience. Perhaps if you were charging at a location which charges an inflated rate. At my current electrical costs in Canada, electric is cheaper per kilometre.
There are definitely situations where it's more expensive, like if you exclusively use DCFCs. My electricity is 15 cents per kWh at home (so that's where i do all my charging), but the local ElectrifyAmerica station charges 48 cents per kWh, which would make my Model 3 cost 13 cents per mile, which is damn near what my Honda Accord costs me in gas (gas is $3.87 per gallon right now. at $3.25 it would be cheaper).
I feel for people who don't have the option to charge at home and I hope that problem gets solved quickly