They only speak loudly it is better not to argue with those who forcefully demand something. They tend to do whatever is going on in their mind and they are usually people who get involved in activities and arguments which will turn into quarrels. They should be told that if they win the bet by trick then win more. When he realizes his mistake he will stop such activities on his own.
These days the likes you can get in social media are considered by people as a form of currency, so if they get a lot of likes they feel as if they have done a good job, even if there is no way to use those likes on the real world, so this creates the incentive for some people to lie and try to make it seem as if they are great gamblers and fabricate evidence to prove their point, and in that case it is better to not even interact with those people and let them to deceive themselves into thinking they are great gamblers.