Interesting topic.
I prefer to eat by myself, actually. I'm an emotional eater, when I'm stressed food is the first place I go to (I know, it's disgusting and unhealthy *sigh*) If I'm eating around other people who are not eating I start feeling anxious. Usually I'll offer my food to whoever is sitting next to me (yes, strangers too, lol) so that I don't look as weird just eating by myself when nobody else is. However, if I'm at a party or with a group of friends, I like eating with everybody else and it doesn't bother me.
So in short, I don't like eating alone when I'm not alone. Weird.