Me personally, Formula 1
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I was going to say all equally, but two do stand out. The formula 1 grand prix in Melbourne, because of the cost, hassle if you want to do anything else in the city at that time, and the pollution it causes. Also The Melbourne Cup and rest of the Melbourne spring racing carnival. The amount of animal deaths it causes, as well as risks to jockeys, the ridiculous money it costs to hold and the amount of binge drinking that goes on.
Didn't know what you were asking at first. 😁
But, the current version if the Dakar rally. Loved it when it was in Africa, watched it every year, and didn't mind the South American incarnation if yhe event but now the Saudi regime have got their blood soaked hands on the event I'll never watch it again.
Damn tiny keyboard on my phone!! Apologies for the typos. 😬
Any race involving animals. Particularly horse racing. Yes, horses love to run and are built to run. But they are still creatures that need rest and not over exert themselves. They are large animals standing on slim legs. When pushed beyond their limits that can collapse and/or badly injure themselves. It's not uncommon for horses in the Mongolian horse races to die mid race.
How horses are treated and all the d***s pumped into them is horrific.