A lot of people did rejoice in McGregor's loss, but his loss was immensely qualitatively different. He jumped up TWO weight classes, on short notice, to take on Diaz. Rousey had, until the Holm fight, dominated a weight class that the UFC specifically created for her, and to shield her from Cyborg. Rousey has even refused Cyborg's offer to meet in the middle at 140, while she was speaking openly -- after barely 10 wins to her credit -- of planning to retire undefeated. And so on.
At least let's get the facts straight.
1) In Invicta mma there was a bantamweight division before the UFC co-opted it. The UFC didn't "invent" or "create" this division to appease or showcase Rousey. They did however steal almost all of Invicta's fighters from that division. Since the bantamweight division has been a legitimate division in boxing since 1890 I doubt the UFC can claim any sort of proprietary ownership.
2) Rousey NEVER ducked or was "shielded" from "Cyborg". Justino is two weight divisions above Rousey. Oh yes, Rousey fought at lightweight in mma, but that was clearly not her optimum weight. Rousey has NEVER had a problem making 135. Not close. Justino however has twice been found to use and abuse performance enhancing drugs. Specifically steroids. Dana at that time was willing to create (steal) a 155 division from Invicta. When Justino was about to sign onto the UFC she backed off when Dana instituted mandatory blood testing. One day later.
3) Justino won her championships and destroyed careers by cheating. Rousey is the champion. Her position was and still is that Justino has always had the easy way out. Why should she (Rousey) continue to give this cheater a pass? Rousey has always done things the right way. Her blood given to the Olympic committees remains conditionally tested into perpetuity. Justino cheated, lied, gave false samples and tried to bluster her way through to a fight with Rousey. Then complained when she had to cut weight to fight the CHAMPION. To my way of thinking this cheater should have been banned from fighting and rescind all of her titles.
4) Rousey from the moment she started to compete in the UFC has said she would fight no one at a catch weight. No one except her idol Gina Carano. For her she'd make an exception. Now that this liar has finally had to sacrifice something to make the 135 division perhaps she'll get to fight Rousey, Holm or Tate. But she'll need to earn it first.
5) Unlike McGregor Rousey has never disrespected an opponent before or during a fight. Yes, she refused to shake Tate's hand after Tate made comments about people close to her during their Ultimate Fighter series, which Rousey took as disrespectful. And yes, Rousey took umbrage when Correia said she hoped Rousey wouldn't kill herself after she (Correia) beat her. Rousey's father had committed suicide, and that remark was particularly insensitive. Rousey has always been respectful and complementary of fighters, venues, promoters, even countries. The same cannot be said of McGregor, whom I love as a fighter by the way.
So please get your facts straight before attempting to call out Rousey.