Yeah, such people exist and I've seen them too, and you won't believe how annoying such people are. And some are even worst than that, when they are gambling, if you are around, they will ask for your advice or suggestion and when you suggest something and they place a bet based on that if they win, they praise you and be happy, but when they lose, they simply blame you for that.
Even if they don't say it in front of you, they will say it to someone else in your absence and that makes you way too angry but you decide to just leave them and don't give them any attention the next time when they are around.
Yeah, many gamblers will try to blame someone else for their own action, and also explain unknown phenomena (winning in a roulette, etc) with some weird explanation like they won because they had a beautiful girl next to them, or whatever.
It's all fun and games while they are winning, but it becomes rather nasty when they lose. And many gamblers lose it all in a night, and can get quite destructive. Best to stay far away from that negative force, otherwise you might end up in a bad situation.