I don't think they meant any harm, they are probably nice people. Stereotypes come with every discipline, and honestly when you watch things like Spruce Meadows you see horses galloping around yanking with large bits and martingales so people may have picked up the notion that most jumpers have hot horses and use a lot of equipment to control them. This is of course far from the truth, it only has to do with what the media shows and how it is perceived. I myself have a lot of fellow teenage riders at my barn who do english pleasure or eventing who assume that I am snobby, finicky, and no fun because I do dressage. Take this opportunity to educate them and let them meet your horse and maybe give a demonstration, don't hold it against them that they don't know any better. It sounds like a fantastic barn, and once people understand you and your discipline things should go smoothly.