Social media: Reminder – the purpose of social media is to make a fool of yourself
His “airfare” prices are for same day ticket prices on airlines, versus buying in advance. If you bought a couple weeks in advance, the airfare falls to below $100.
Car Rental costs start as low as $29–$31 per day for compact or economy vehicles at Charlotte Douglas International Airport, with an average daily rate of approximately $62 in Atlanta. Fuel costs for the roughly 240-mile drive are estimated at $27.86–$36.77 one-way, depending on the route and current gas prices.
Total estimated cost for a one-way trip involving a rental car is approximately $60–$100 for fuel and rental fees for a single day, though total expenses will increase significantly if the rental period extends beyond 24 hours.
The cost of building a high speed rail line between those cities is apparently estimated at $27 Billion.
His argument is a classic strawman argument that hides available options in order to pursue his niche preference of trains.
You can also take a bus and save even more money:
Beware of arguments based on cherry picking data