RDJ has talked about that on Joe Rogan. Basically he got lucky that people took more offense to Ben Stiller playing a retard so his part in the movie got overshadowed.

Also he's probably too popular to cancel. It's like when they went after Dave Chappelle, basically nothing happened. Some celebrities are too big for the mob to go after. Only the government can really take them down, like we saw with Kanye.