I wish I knew. But even then I probably wouldn't be able to do anything about it.

Suggestion 1: Never quite make eye contact with this person. Go ahead and look at them, but soften your focus or focus just off their eyes.

Suggestion 2: Keep some sort of physical barrier -- even if only symbolic -- between yourself and this person: a chair, table, purse, held garment, book, wall, moat filled with piranhas, etc.

Frowningdown