"I'm not an expert on the Malaysian sense of humor"

In this quote, Ben Stiller is acknowledging that he does not have a deep understanding or knowledge of the humor that is specific to Malaysia. He is admitting that he may not totally grasp the cultural nuances and referrals that make up the Malaysian funny bone. This might be viewed as a modest and self-aware statement, as Stiller is recognizing his own constraints and acknowledging that he may not be able to completely appreciate or precisely represent the humor of a different culture. It likewise highlights the importance of cultural understanding and level of sensitivity when it comes to humor and comedy.