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.
There are people who are really that highly reactive on something which is obviously not true on which if they do have that chance then they would really be making out such comment which might lead into argumentation if that someone who do make out some claims would really be insisting that he's really making some bucks rather than on losing. It would be normal that human beings would really be on such denial on the time that experiencing such problem. So its better that you shouldnt really be that making those kind of comments and just let them be on learning those
common life lessons on which it would really be just that common that things turns out to be always in the end of the line if we do speak about learning.