double negative = you do jerk it
Not that I'm siding with anyone, but that isn't a double negative.
"I don't jerk it, not because it's a sin, but because..."
Adding the comma makes it clear that he was stating his opinion, although the comma isn't necessary.
You really do nothing but stalk my posts and look for grammatical errors, dont you?
I made a mistake, ooh no, lunch me for it.
...and you do a poor job of defending yourself by actually agreeing with him.