Belgian jockey Christophe Soumillon has lost about £50,000 in prize money and been given a five-day ban for flouting the new whip rules.
He was punished after he struck his mount six times in the final furlong as he won the £1.3m Champion Stakes on Cirrus Des Aigles at Champions Day.
"They changed the rules five days before the race. How can they do that?" asked the 30-year-old.
The penalty cost him the biggest pot won by a jockey riding in the UK.
Tougher whip rules and penalties that only allow Flat jockeys five strikes in the final furlong have angered riders after they were introduced on Monday.
The new guidelines mean the whip can only be used a maximum of seven times in a Flat race and eight times over the jumps - roughly half the previous limit - with a maximum of five of those strikes allowed within the final furlong or after the final fence.
Soumillon was riding in the UK for the first time since the new regulations were brought in.
He was punished after guiding his 12-1 shot to victory following a neck-and-neck tussle with So You Think in the mile-and-a-quarter contest on the richest ever raceday in Britain. The Belgian rider is estimated to have lost about £50,000.
After a stewards' inquiry, Soumillon said: "They have given me a five-day ban and have taken my money from me. How can they take my money?
"They have changed the rules five days before the race - how can they do that?
"For such a small thing, I get a big ban. I think the jockeys should get together because it is impossible to work this way."
Soumillon said he could not understand why the rules were not the same around the world.
"I'm very embarrassed for English racing today," said the jockey, who is based in France.
"You have a lot of problems but the whip is not one of them.
"Jockeys are not here to whip horses, they are here to make the horses do their best and that is what I tried to do."