I have had the same attitude from folks who where supposed to be my friends back when I had my first and second horses and lived in Phoenix. Both my very first (and second) horses were Arabians and I rode everyday, rain or shine, and often by myself, and nearly always out on the trails.
My Arabians took me everywhere and were wonderful, people oriented horses! (I kept them until they died at ages 24 and 26).
What I finally realized, and it was totally true, was the people who bad-mouthed Arabians couldn't handle and control their own horses. People who hardly rode, whose horses bucked them off, whose horses jigged and weren't trust-worthy, those were the people who said they didn't like Arabians.
So what I finally decided was, when people say they don't like Arabians, what they really mean is they can't handle Arabians and Arabians are too smart for them, or they don't ride nearly enough to keep one in shape. If you ride a lot and are a dedicated horseman(woman), then Arabians are wonderful horses for you. They aren't for the weekend warrior types who treat horses like ATV's.
Arabs are great, Its like comparing a Jack Russell (which I have) to a Golden retriever. Both great both very different.