I wasn't always what you call a "jackass". A long string of women turned me into one. Blame your sisters.
This sounds like a "fool me once, shame on you. fool me twice, shame on me" situation.
You only get to blame the first one. After that, it's your own fault for not learning from past mistakes and continuing to choose poorly.
Note this applies equally to women who blame the entire male gender for their repeated poor choices of partners.
Actually I was lied to my entire life as to the essential nature of women. The first one I could believe was a bad apple. Then the second one, even after being more cautious, turned out the same. By the third time, I started to get suspicious. The fourth made me seriously question my assumptions and the fifth was like finally swallowing the red pill after a lifetime in the Matrix.
I am not a misogynist. If all women are like that, then it's not their fault. It would be like hating snakes because they bite. It's not even fair to judge women by men's moral standards. I love women like I love my dog. I just don't play chess with either one.
Here's an interesting article (written from the perspective of females looking for a male partner) that suggest that 'nice guys' (or 'nice girls') don't exist; rather, everyone adapts their personality (to various extents) to the people around them and the situation at hand. It's then up to each individual to adjust their personal behaviour and appearance to elicit the response they want from the opposite sex.
So instead of complaining about the dearth of nice guys or the abundance of douchebags, start thinking about what you can do to make then men in your life treat you the way you want. Because that is what is going to make the difference not finding some "perfect guy" with some supposed personality type. You don't find perfect men, you elicit perfection from men.