like most people who post here you need to read Paul Graham's early work. professionalism is harmful to quality of work and especially so in startups. professionalism is an artifact of the industrial revolution and is not relevant in all fields. computer programming is to some degree post-industrial and professionalism is irrelevant and archaic for many programmers. criticizing a programmer for being unprofessional is like criticizing him or her for not being well acquainted with the phases of the moon and the effect those phases have on that programmer's crops.
rubbish. it is easily possible to be professional and produce excellent work. it doesnt have to be stuffy and haughty that's all :)
(and yeh I read his early stuff: not a fan. At every stage in a startup you have to get to a stage where you need to show some professional gloss to prove your not just another backroom programmer - IMO it is the core reason why a lot fail, they cling slavishly to that "fun guy" image and lose corporate custom because of it ;))
@the previous poster: I wouldnt call it unprofessional per se. Empassioned perhaps :D
While this is terribly unprofessional, Techcruch had it coming to them.