Consider a different point of view, the more people that know about my DD's food allergies, the safer she will be.
The more people that know about my DD's food allergies the better chance she could be helped by others during a reaction instead of people standing around wondering what the heck was wrong with her.
The more people that knew about my DD's food allergies the better supported she was as she slowly gained independence and became responsible for herself and it was possible for her to go anywhere, do whatever with her friends, sleepovers, etc.... without parents or parent involvement.
I did not want my DD's food allergies hidden. No at school, not at dance school, not at her sports events, not anywhere. And you know what was great? Her fellow classmates, teammates, peers! Better than their parents! Compassionate, careful, questioning, cautious etc... Many positive years in public school.
She is now in her second year of college. She had anaphylaxis to a sugar cookie in the wee hours of a morning last fall. Her roommate gave her the Auvi Q and called 911.