Conor McGregor didn't mince words in his response to Floyd Mayweather after the former pound-for-pound boxing king said that racism played a part in the Irishman's rise to fame.

Mayweather's comments started out aimed at his own sport of boxing, but he eventually turned his ire toward former UFC champion Ronda Rousey and McGregor, calling reactions to his trash talk "biased" compared to the vitriol Mayweather received during his career for making similar remarks.

McGregor fired back on Friday night via an Instagram post where he took direct aim at Mayweather's comments and responded in kind by reminding the boxing champion of the prejudices he's dealt with his entire life growing up in Ireland.

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"Floyd Mayweather, don't ever bring race into my success again," McGregor said. "I am an Irishman. My people have been oppressed our entire existence. And still very much are. I understand the feeling of prejudice. It is a feeling that is deep in my blood.

"In my family's long history of warfare, there was a time where just having the name 'McGregor' was punishable by death. Do not ever put me in a bracket like this again."

1. Rolling Stone, thank you for putting me as one of your top 25 sex symbols of 2015! My Mother will be delighted and proud! 2. ESPN, FOX, BT Sports, MMA Fighting, Yahoo, MMA Junkie and Sherdog thank you all for awarding me fighter of the year 2015! I appreciate all the hardworking media and their love and commitment to the sport is truly valued. 3. Fighters Only MMA Awards, thank you for the nominations for Fighter of the Year, KO of the Year, International Fighter of the year. I will be in Las Vegas to attend the event and collect all my awards. 4. Floyd Mayweather, don't ever bring race into my success again. I am an Irishman. My people have been oppressed our entire existence. And still very much are. I understand the feeling of prejudice. It is a feeling that is deep in my blood. In my family's long history of warfare there was a time where just having the name 'McGregor' was punishable by death. Do not ever put me in a bracket like this again. If you want we can organise a fight no problem. I will give you a fair 80/20 split purse in my favour seen as your last fight bombed at every area of revenue. At 27 years of age I now hold the key to this game. The game answers to me now. 5. Media instigators/An Garda Siochana. I apologise for having the air-soft in public. I was simply rehearsing for a potential upcoming film role. I understand that the more traffic a story can get the more revenue it generates. So I understand and respect that the media must create these stories and these situations even if at times it is at other people's expense. We've all got to eat. And I eat well. So I will not complain. 6. My next fight. What can I say, it's just another night of easy work for me. I don't just own the game. I run it too.

A photo posted by Conor McGregor Official (@thenotoriousmma) on

The UFC featherweight champion wasn't finished with his tirade either, because he then challenged Mayweather to a fight while trashing the retired boxer's last bout, against Andre Berto, which earned paltry numbers on pay-per-view by comparison to most of his fights and didn't sell out the MGM Grand Garden Arena.

McGregor has welcomed a fight with Mayweather in the past, and the outspoken Irish fighter certainly didn't back down this time either while issuing another offer to the undefeated boxer.

"If you want, we can organize a fight no problem," McGregor wrote. "I will give you a fair 80/20 split purse in my favor seen as your last fight bombed at every area of revenue.

"At 27 years of age, I now hold the key to this game. The game answers to me now."

As of yet, Mayweather hasn't responded to McGregor's post.