What kind of an analogy is that? It is not only flawed but does not relate to your argument. I guess the point that illumen was trying to make is that PHP can be used in popular real world applications and is
"proven" to scale. Just like Facebook, you can look at Wikipedia, Wordpress, Tumbler or earlier days of Youtube all of which was/is written in PHP!
Be comfortable with the language you prefer and quit whining about the rest!!!
In no way whining about PHP, I still maintain various projects which use it and for which I think it's well suited.
The analogy was only meant to demonstrate an objection to arguments along the lines of "it's used by something popular therefore it's good" or "lots of people use it therefore it's good" which seem to be common points put forward in favour of PHP.
Popularity/ use by someone popular may be an indicator of quality but it very often isn't, the analogy isn't intended to go any further than that!
Be comfortable with the language you prefer and quit whining about the rest!!!