His handle was mgrunin[1]. He made some posts about how much money he'd sent to CoinBase, and how they still hadn't sent him BTC. A google of his name (at the time, at least) revealed a lot of ostentatious pictures tagged things like #rich.
I wouldn't call them scandalous. (I'm not sure I'd call him an HN user either, but we'll leave that aside.) I'd call them entitled. He used HN's community to put CoinBase in an awkward position, and while CoinBase was certainly providing abysmal customer service HN is not anyone's personal army. As DanielRibiero pointed out[2], its not like he didn't have other avenues.
https://news.ycombinator.com/item?id=6929705