Is dropping geographic locations for upcoming trips a bad move?

I get a little uncomfortable when people name drop where they're going on vacation or their business trips without being asked. There's this company a few floors below where I work that I always hear complaining about their upcoming exhausting trips to London, Tokyo or where ever. I just think its kind of pretentious to say something like, "Hey I'd love to spend time with you this weekend, but I'll be in (insert location)." I think if you're asked where you are heading for your trip, then its fine to speak up. If not, I get a little uncomfortable. Anyone agree or is it just me?