Ofcourse this can be the case where a person hates gambling or thinks bad about gambling, try gamble once or twice and may win good amount. This is enough for him to change his point of view about gambling and stand with those who are gamblers
I have this habit of associating with anybody regardless of the type of person you are by default. Whether you smoke or you drink, it doesn't stop me from liking you but you can't influence me with your lifestyle and I wouldn't say you should stop, after all you are an adult and you have the right to choose the kind of lifestyle you want, that's how I will view anyone that gamble even I don't do it but some people will think they are better than you because they don't like what you do.
Actually, it is the money which determines people's decision to gamble or not. Those who are gambling and winning they won't leave it and even those who are losing always have the hope of winning. Usually, people who never gamble, say bad about gambling. Once they gamble themselves, they tend to like it.
If indeed people don't loss money in gambling, some of the parents that see gambling as evil thing to indulge will also be doing it. Some parents don't see the good side of gambling even though you remove the loss effect, they tend to see it a phycologically thing that affect the way a child think which is true to some extent but not entirely the way the convey it, gambling actually makes you think smart if you remove the greed for the money involved.