I think anything can be an addiction, or can have addictive aspects; any behavior that jazzes our neural activity in ways we find irresistible could potentially be addictive.

That said, there's certainly plenty of differential where types of addiction are concerned; for instance a behavior addiction is going to be very different in nature than a narcotic substance addiction. But that doesn't take away from the fact that there can be addictive properties to a behavior that affect us without our even knowing sometimes.

I think there's a ton of people who are addicted to ego-strokes, however they may prefer to get them. It's sad that anyone feels they have to put others down to make themselves feel bigger, but I would imagine that it's a very difficult habit to break. Especially in cases where no significant incentive to do so has been perceived. Just my opinion.