I rarely disagree with Challenger, but I don't like the Hijab in itself, much less western women wearing them.
Is it the Hijab you have an issue with, or just women wearing headscarves in general? Western women in western countries wear headscarves and/or veils as the mood takes them or for fashion or even religious reasons (i.e. church veils).
I don't see it as an issue. Unfortunately, wearing a hijab is the law in Iran, so the Swedes had a simple choice, wear a headscarf or send an all male delegation. Surprisingly, it's not the law in Saudi Arabia, so the Queen needn't have worn one when she visited, it was a polite gesture which probably helped secure some lucrative trade deals. Often in business, you do what it takes.
Now for me, Burka's, Chadors and Niqabs are a different matter...we all have our prejudices.