Arenโ€™t they dangerous?
A pissed off stingray is what killed Steve Irwin, The Crocodile Hunter.
It literally stabbed him in the heart, which seems to me like an unlikely way to die to a stingray, but Iโ€™m no stingrayologist, so take that with a grain of salt.
They hurt like a bad beesting. Lifeguards will put your foot into a bag of hot water (denatures the venom) and after a few minutes, you are fine

Lifeguards will put your foot into a bag of hot water

What if I get stabbed somewhere else? Do they still just put my foot in a bag of hot water?

Yes. You can put your dick in the hot water too if it gets stung