Oh for the love of....
Ok, firstly, I just wanna say it's very sweet of you to have empathy for and have the intention of defending SIL
However, I would urge you to reconsider your interpretation of Jono taking the piss for giggles. Especially as an American; I lived in the states once and I know that taking the piss a brand of affection that is just not understood there.
I say this as someone who has personally experienced the brunt of a pissed off Jono (never mind Jono, it's long forgotten :)) Besides, I kinda can be an asshole when needed ). Jono doesn't get aggressive or disparaging. Instead he'll publicly write a blog post 'trying to understand such thugs' , ohhh how could this have have happened', peace love and harmony and all that.
With most people you don't have the luxury of looking back and learning how someone behaves in certain situations when they have the intent of doing certain things; With Jono you do.
Please take the time to do that and understand what people are telling you here is true. I really do believe you've misinterpreted Jonos intent here. Although, yeah, it was pretty boring (sorry, it was).