I don't think calling people a generic insult is usually considered terribly effective.

[He makes a slightly dismissive "you know" gesture, hand held palm up. He's actually starting to enjoy himself a little, but there's no point quitting just yet.]

Have you considered taking your highly important research somewhere less public? Then you might be less upset by other people also using the space.

[As she pointed out, it is a public place. He has as much right to be there as she does.]