Ronaldo will make his Allianz Stadium debut on Saturday, when Juventus take on Lazio.
Hardcore Lazio fans said women, girlfriends and wives should stay out of the "trenches," a famous stand in the team's stadium.
Keita Balde Diao is one of Europe's hottest prospects.
Jaap Stam has defended his fellow Dutchman's record.
The Lazio winger has been heavily linked with a move to Manchester United in the January transfer window.