Chile midfielder Vidal was shown a second yellow card by Kassai in the 84th minute for what was a clean challenge on Marco Asensio, tilting the game in Madrid's favour as they entered extra-time trailing 2-1.
Ronaldo's first 15 Champions League goals came for United - including a towering header in the victorious 2008 final against Chelsea in Moscow - before he joined Madrid in 2009 for what was then a world-record fee of €94million.
"When they rob a game from you like that, it's very tough".
Arturo Vidal was even harsher with the referee: "This robbery can not happen in the Champions League".
But about the largest periods it's been Madrid's captain excellent Ramos and not Ronaldo who has been so vital to Los Blancos' achievements.
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Mainz are fighting hard to avoid relegation and find themselves only outside the bottom three on goal difference.
Cristiano Ronaldo was congratulated in the Real Madrid dressing room after 100th Champions League goal on Tuesday night.
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"We're very angry, a game with that much intensity can't be decided by the referee". A goal from a missed offside, an escaped red card, and a penalty in a shootout victory for which Ronaldo's winning spot-kick - after another largely anonymous outing - stole the headlines in an 11th Champions League success. "We are not happy about this. It's time to introduce videos for the referees".
"Maybe they will not whistle him any more", said coach Zinedine Zidane in defence of his star man.
It had been a quiet season for Cristiano Ronaldo.
"There is no luck in football, you must win, and we won both games", he added.
"In the first half we had many opportunities and we could score a goal or two, also in the second half too". "We want to win it again this year. We have been shafted in the truest sense of the word", Rummenigge said in quotes reported by The Times.
"A year of hard work down the drain. We are going to fight for it".
Trailing 2-1 with six minutes to go, Mariano started the revival before Ramos again proved the darling of the Bernabeu with a last-gasp victor from Toni Kroos' corner.