I think it really depends on the person and the situation.
If someone had a really nice time with you and then gave you a hug with a little back scratch then no big deal. I think it would just be a way to show some affection in a warm-hearted way.
That said, I've hugged a lot of people and most of them are hippies. So, I am used to these kinds of hugs. In fact, I kind of resent any hug that is not a really good hug. I am like, "What am I? A cheap hug thrill? Something to just get your hug fix real fast? NO! I AM A HUMAN BEING AND DESERVE A NICE HUG!" But, whatever.
I'm just so not into shitty hugs...