Many people find it difficult to accept who they are and the bad habits that they have, accepting a habit is the first step that will determine if any help offered to you will work. As a gambler, will you find it offensive if you are referred to as a gambling addict? will you easily accept it or try to give excuses like some other people do, saying that they are not addicted to gambling when the signs are clearly there. Do you think identifying as an addicted gambler will make people stereotype you. The answer is different for every gambler here.
Not really, but people should stop stereotyping if they don't don't know someone or they just saw them once or twice since it does create a chaos everytime they judge someone on what they just saw in the first place. You never know what kind of people you are dealing with it's either you will get in trouble or be humbled by someone. So if you have nothing good to say, just keep it to yourself and let the people enjoy what they want. Perhaps if this person is their close friends saying it to them it would be different since they would gladly accept or ignore their friends advices since it's all up to them.