They really have an unfair bad reputation, don't they? I don't really have many ghost pokemon myself, but my friends do, and all of them have always been very kind and sweet.

Of course, there is always the occasional individual that is... less so, but I think that happens with any pokemon type of species.

[The Gengar that had made Armin proclaim his love for Angel's boobies on the network was a jerk because he was a jerk, not because he was a ghost. He probably would've been just as much of a jerk if he had been, say, an eevee or a caterpie.]