In a recent interview with The Hollywood Reporter, Stiller admitted that he was a little hurt by words of Ebert (although I'm sure many filmmakers have been hurt by Ebert). But, a few years later he ran into the famed critic backstage at The Tonight Show where Ebert actually apologized to Stiller for the negative review and that he actually finds the film to be quite funny. Stiller replied, "Thanks for telling me backstage at The Tonight Show."
The interview also confirms that, yes, Stiller is still working on a Zoolander 2.
Stiller, who is working on a sequel to the popular film, said: "It's the old adage: if you believe the good ones, you have to believe the bad ones. I know people who like reading review, but, for me, you can always feel what's getting good reviews or bad reviews. People will let you know. For me, that metric is one you can't get wrapped up in. What do you do if they don't like you? I guess you can learn from them."Source: The Hollywood Reporter