Any sort of racing that is fueled by a motor. Waste of gas and tires.
I have heard an argument that racing pushes the envelope of what can be accomplished by the cars, which then trickles down into more efficient and better consumer vehicles.
Take F1 regulations as an example. In the early 2000s they used about 200kg of gas. In 2013 they used about 160kg of gas per race. Now they are down to 100kg, and in 2026 they are aiming for 70kg. That's cutting the fuel usage by more than 2/3. 70kg is about 26 gallons, which is an absolute drop in the bucket compared to the fuel used by the spectators to get to the event - or any live event, be it a concert, street league, or the X-Games.