Is Skyping Without a Headset in Public Obnoxious?

There are some perks to working as a blogger, and one of them is that anywhere with Wi-Fi is your office. Great! But often times, when working in a coffee shop for instance, you experience some outrageous behavior.

Right now, someone six feet from me is sat using Skype, very loudly, without a headset—and it's riling me. I can see arguments in support of it, sure; it's not unlike people having a real-life conversation just across the way from me, I guess. But I can't help but think that, on some level, it's pretty obnoxious. Maybe it is, maybe it isn't: so I thought you could help me decide. Thoughts?