Depending on the person who made such a statement could be a trouble for both the player and the person. As the gambler wouldn't stop immediately and the complainant wouldn't stop until he sees the gambler is not part of the habit. However, when we respect our family, it's crucial in making us feel more comfortable at home. But that wouldn't be simpler for a gambler, who has been in the game for long. He'd hardly change, I mean not immediately. That's why the person who disturbs the gambler must not pest his life to feel uncomfortable about himself. Because if he doesn't feel comfortable it could be trouble in the sense that the gambler may begin to avoid the person. On the contrary if the gambler understands that his habit is no longer favorable to the people around him, he is expected to make an adjustment.
Even if it's requires stopping the habit. As family means lots of fun to us than gambling would offer the gambler on the long run. No need proving anybody wrong, it may cause the gambler to get addicted. In the case of a stranger, they would be no need to fidget. Holding some conversations with him is excellent. At least to remove his doubts about gamblers being some weird people who don't add value to the society. That's what most people think whenever they see a gambler. Since they've got little information on gambler, that they can't differentiate between an addicted and a responsible gambler. The need for a close explanation would do the work. So that he wouldn't continue to see gamblers the same. Opening up to him that some gamblers don't misbehave like he's believed, growing up. Or wherever he got his intuition about gamblers.