I really don't mind sharing food with others if I have some to share. I will even buy specific food to share with specific others because I know they like it. I am not sure about me being an aspie though... my younger brother who is an aspie, he doesn't seem to like sharing as freely as I do. But, I'm a people-pleaser.
What bugs me is when I'll be visiting someone at their house, they have their own food, I bring something for me to eat and they are staring at my food like they want some. They don't even ask, they expect me to offer. So, I started bringing only one item that I could not share, and that didn't make them happy.
As for letting people take a bite of my food or take a drink from my drink-if they touch it, it now belongs to them. I'm OCDish about germs in that way. I start to feel sick thinking about eating or drinking something that someone else has put their mouth on. Except for my boyfriend, he can share my food and drink that way cause we kiss so it's only right to deny my OCD a place for those thoughts.
A reason for me not to want to eat in front of others is that while I was living with my parents, my dad would see me having something to eat and want me to get him something, too. That kind of ruins lunch, sitting down to enjoy it and all of a sudden there's a guilt trip being laid upon me.
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Let us comfort each other, and move tenderly when we are able. Let us hold hands and walk bravely, or fearfully together; for as long as there is Love, there is Hope, that everything will be okay, including the things we say are not.