It’s not an “allergic reaction” per se, merely “deemed as such”.
GMO’s ( not hybridizations!) are poison, there is A difference.
There are people allergic to soy. A friend of mine had a terrible time with his voice until he discovered the allergy.
Try to find ketchup without soy — can’t.
He finally found a mayonnaise/sald dressing without it.
More medications are coming out with warnings: “Contains wheat, dairy, soy”