I've worked in Saudi Arabia - and eaten with the locals - belching does appear to be the norm. I don't believe it is considered good manners though (as is sometimes portrayed in films) - Just not necessarily bad manners.
Just Go To A Local Bar.. Men Who Have Been Drinking Laugh. At Anything ..Broccoli And Beans Cause This.. As Far As Country. Depends On How Dignified Their Manners Are..What's Not Funny Here.. Could Be Hysterical In Another Country.. British Humor Is More Bawdry. Think Monty Python Mr Bean Shows.