Believe it or not.... you get immune to it..

or maybe it's just getting 'used to it'? I've known many beekeepers, having grown many crops requiring hives for pollination.... all of them shake off a bee sting like it never happened.

Wasps, however, and as you point out, are much worse. Never the less.. you get stung enough and while I wouldn't dare say 'you get immune to it' you do get.... well, I guess accustomed to it? Accustomed to it BUT... yes, you will leap from a tall building to get away.

Reminds me a bit of electrical shock. I worked as a computer repairmen in the Army.... constantly checking voltage, amps, etc. I got shocked daily, (mildly), sometimes badly but that was rare - but it did happen. I got so used to it that the 'mild' shocks, (not the bad ones), I wouldn't even use my multimeter... I'd just grab the connections to see if there was flow. What would cause most people to shriek I barely noticed. - JamesJM