> As nearly as I can tell from a web search, he is someone puts some code on Github and writes a blog.
A civil and mechanical consulting engineer [1] who also has put some code on Github and writes a blog.
> Why does he feel like he gets to talk down to someone who has sent rockets into space, on the subject of engineering?
Probably because, unlike Musk, he actually has professional qualifications in the kind of engineering at issue on the points on which he is criticizing Musk's proposal.
A civil and mechanical consulting engineer [1] who also has put some code on Github and writes a blog.
> Why does he feel like he gets to talk down to someone who has sent rockets into space, on the subject of engineering?
Probably because, unlike Musk, he actually has professional qualifications in the kind of engineering at issue on the points on which he is criticizing Musk's proposal.
[1] See, e.g., http://www.codeproject.com/Articles/582981/A-Coder-Interview...