The former Otago and Dunedin halfback, who now plays for the Chiefs, has tweeted his disgust at the comments made by Folau about gay people.
Folau has caused an uproar over his comment on Instagram last month that God's plan for gay people was "Hell, unless they repent of their sins and turn to God".
Weber's tweeted it's 'kinda sick' that players stayed quiet on the issue.
"Kinda sick of us players staying quiet on some of this stuff. I can't stand that I have to play this game that I love with people, like Folau, who say what he's saying," Weber tweeted.
"My cousin and her partner, and my Aunty and her partner are some of the most kind, caring & loving people I have ever had the pleasure of knowing. To think that I play against someone that says they'll go to Hell for being gay disgusts me," Weber added.
The Waratahs visit the Chiefs on May 26.