Name something you will not eat, under any circumstances, at a potluck dinner or picnic
For me, it's anything with mayo. Some people don't understand it has to be refrigerated. There are other things I won't touch, but if it has mayo in it. that's an automatic deal breaker.
Name the things YOU won't eat.
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or anything with onions in it. My mom, as a newlywed, made beef patties with onions in them, and when he realized, refused to eat them. I don't think her feelings were hurt anyhow. He saw action in the Pacific, so she let it pass. She told me years later when I had understanding, "Daddy won't eat onions!" I don't think she ever found out the reason.
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"Never order anything with mayonnaise."
"Never order tuna fish sandwiches."
The programming didn't end there.
... also deviled eggs pose no hazard if the eggs were cooked correctly beforehand. Again, no mayo in deviled eggs either.
I agree with you about raw onions, but not because of potential food poisoning. Raw onions make me seriously gaseous, which would ruin the festive mood.
... that German potato salad is made with no mayo or mustard, no chopped up eggs, nothing to spoil or give you food poisoning. That's the only kind that I make and it's why I'm sort of picky.
Different strokes for different folks, I guess 
I hate that shit! So gross...
...I took two years of high school Spanish. I did better with French. One day the teacher walked around the room and called on random students and made them say a sentence in Spanish. I made one up and beamed with pride. She said "Congratulations. You just told me that Jose eats handkerchiefs and milk."
I said "Jose tomo panuelos y leche" instead of instead of "panecillos"...HEY! I thought it was an honest mistake.
means to drink. So your sentence would still be incorrect although a little bit less funny: "Jose drank rolls and milk". 
Grossest thing in the world other than brains and other organ foods.
Not overly fond of eggs either as I threw them up when I was a toddler. Soft boiled they were, sick sick sick!!
Other hated foods include:
Blood pudding.
OMG.
I could go on on but won't!
So few understand but I do!!
YUCK, yuck yuck yuck!!!!!!!!!!!!
You're one up on me...I've never been to a picnic or potluck that had Rocky Mountain Oysters.
After some reflection, I came up with something: chicken gizzards. With free-range chickens, gizzards contain tiny rocks that serve to grind whatever the chicken eats. Pass!
Old tomato paste with sugar? Whose brilliant idea was that??? 
I do like tomatoes though.
Regarding coffee, I'm with you. I could never have just a single cup.
Yeah, I don't trust people. I live in a community of mostly seniors and about 1/3 of them have some form of dementia. You think I'm eating anything they bring to a potluck? We hear all sorts of stories in here about how someone left something out for two days and then brought it or forgot to add the main ingedient or used salt instead of sugar...I could tell you some stories.
So now. Every year our neighborhood has a potluck and for some reason I'm always busy on that day
I also avoid things that I'd ever make myself, since mine would be better, and I'd just be disappointed. This includes pie.
Other than that, the potluck dinners I go to tend to be family matters, and I trust my family with cooking, or Hispanic/Latino affairs, which means I'm going to try everything... if there are no shrimp in the dishes.
TlalocW
Can't say anymore that I've never been invited!
..... prepared at someone's house I do not know.
