Interesting.
I’ve had a somewhat related experience: my first summer in Texas about a decade ago, I was stung by wasps, bees, hornets, etc. over 100 times. No idea why.
On the rare occasion I am stung anymore, I don’t even feel it. Well, except if I’m stung by a “tarantula hawk” wasp. Those still sting a bit. Not much, but a bit. (Note: that sting is considered the second most painful after the bullet ant, which is actually a wingless wasp. Never been tagged by one of those.)
There may be a sugary quality to your blood, fat or skin that is similar to the pheromone given off by certain bees.
What the HELL kinds of insects you got down south?!
Some of us have the opposite reaction. I approach shock from certain insect bites, and the inflammation is debilitating.
Lethal allergies can develop later in life without any indication. My wife developed a shellfish allergy at 50. Her symptoms appeared “overnight,” and I’m pretty sure she would die with any significant intake.
I was stung by a bald-faced hornet on the top of my foot almost ten years ago. Excruciating pain, my foot swelled so that I couldn’t fit it in a shoe and it turned blue with an infection that required 6 weeks of antibiotics. Vicious little creatures.
https://en.wikipedia.org/wiki/Bald-faced_hornet
It followed me into the house, which is supposedly unusual.