I hate to sound negative, but I find that some of the worst bores are people who can't stop talking about their last journey. Having been around the world a few times myself, I often have to bite my tongue to stop myself from telling too many "that reminds me of this one time in [random city X]" stories, as people do get bored of hearing them, and they're rarely as interesting to others as they are to the people who were there.
[1] This means not only listening and popping in with comments and questions here and there, but actually trying to imagine the feelings you would have experienced had you been there; or even more interestingly, understanding how the storyteller felt in the context of his or her own life (this requires knowing the person rather well).
[2] The intent is really the main thing here. Some people approach storytelling about their adventures as a way to brag. The "right way" to do it is to tell the story in a way that the listeners can imagine themselves there. This changes the context from "I'm cooler than you," to "I had a great experience that I'd like to share with you."
There is nothing inherent in being a traveler that makes them "weird", though they may be unusual because of their unusual life. I can't see why either having or not having stuff is relevant.
Travelers make great friends who I miss when they are not around.