You should consider whether the criticisms are accurate and true. You should consider whether you are dealing this for the right reasons or not: does this really need to be addressed or is it harmless gossip/banter? Before acting, you should consider what the potential fallout from your actions might be: will it have a greater negative or positive impact on team cohesion if it is addressed?
David Whetham, ‘The Challenges of Ethical Relativism in a Coalition Environment’, Journal of Military Ethics, 7 (2008), p309-310.