The definition of awkward I reckon. Of course the Queen's met and had to entertain all sorts of dubious and obnoxious characters over the years and it's to her eternal credit that she hasn't yet resorted to abuse or violence. Having said that I'm not sure I could have resisted the urge to tell the SNP's latest fantasist what I think of her and her party's ideals.
http://www.bbc.co.uk/news/uk-34177107