I'm a firm believer in Hanlon's razor and always keep in mind that people do mess up. I just don't think it was worth so much to block him AND report him... Did he even get a chance to respond after your last message? People have called me a lot worse for not accepting trades but the matters got settled after more conversation. I guess our tolerance of bad behavior just differs way too much
As for when I mentioned anonymity, your choice to be far from anonymous doesn't stop others from being anonymous; my point was that when people are able to create accounts on the internet which cannot be traced back to them without more investigation, the worst can come out from them and they're less likely to stop themselves when they're about to do stupid things.
Finally, I just have a philosophy of giving people second chances when their first impression leaves a bad taste in my mouth, then allow their later actions to decide how I feel about their character. When I started twitter about 8 years ago (then left) I pissed off a lot of the fan base of a famous house DJ, and I just don't want people on the internet to have bad memories like I do from their stupid mistakes.