Piracy is and always remains theft. The developer in this instance, all credit to them, had the right to flip out at that guy, and their restraint is commendable. But piracy of games (and of films) not only damages video game developers but the players themselves. It makes publishers like Ubisoft create draconian-DRM systems; it makes their CEO say "93-5% of PC players are probably pirates" and it allows those who want to make closed, controlled systems such as the Xbox One and the PS4 all the more enticing. The "I'm poor" excuse doesn't wash, with the massive amount of free-to-play titles, and regular as clockwork sales where games are routinely sold for the cost of a sandwich.
I might even go so far as to say if you're a pirate, only logical to assume you hate video games, because you are doing absolutely nothing to support them and everything to harm them.