I'm very sorry if I hurt your feelings. But do you have many tattoos by any chance? Any ...neck tattoos?
I lived with a pitbull enthusiast for 6 years, and back when she had a pitbull, she walked around with a bayonet in her Doc Martens. She wasn't the sharpest needle in the sewing drawer and I've met many, many pitbull owners like her since.
I've also met a few responsible pit and pit-mix owners who were responsible and intelligent (and with well-adjusted, serene pitbulls), but they were less butt-hurt about it and even laughed at the stereotype created by the majority of pitbull owners.

Could you please give me an explanation as to why pitbulls make up the vast majority of abandoned dogs in animal shelters?
I've found and re-homed (and happily restored to their original homes) nearly a dozen lost dogs over the years and while checking at the three shelters in my area, and the vast majority of abandoned dogs I saw in those shelters were pits. Why do you suppose that is?