I once leased a crazy QH that would act like the sweetest thing until he decided to buck me off - this happened almost every time I rode him.
After that, my parents bought me my Arab mare that would show those QH's what was up any day. On the trail, she was the first to cross water, difficult terrain and at the end was never tired. In the show ring, we could do anything and did well. My sister's Arab was a different story though. She would spook at clumps of dirt, refused to get her precious feet wet, and was wide eyed and fearful on a trail ride. Inside a show ring, she was great.
Arabs are a little more spirited and let's face it, not for everyone. I liked my mare for the very reason many wouldn't. If I started to daydream, she would do something to snap me back to attention. If I started becoming complacent when doing a certain exercise, she would do the opposite of what I wanted. I started riding when I was 4 and the stable where I started only had Arabs, so perhaps I was just more accustomed to the way they think. Had I started at a QH barn, my breed preference might have been different, who knows.
I've never heard of someone hating Morgans specifically, however, I haven't had much experience with them. I've always thought of them as being wonderfully versatile, well-rounded horses.
Too bad the lady your dad was talking to was so rude. I almost feel sorry for people like that, because they miss out on so much with their close-mindedness!
Here's a picture of my "crazy Arab" growing up with me taking a nap beside her. Man, she sure was a nutcase. (I know, not the smartest move on my part, but let's say at 12 yrs old, I didn't always exercise the best judgement.) Sam3.jpg