Is there possibly more to this story? As it stands it looks like the interns made a polite request and fired for it. I understand the "intern is a guest" argument, but he/she is also a future employee playing that part and would like to be treated as such. If any polite request is countered by firing I can't imagine that will be a good place to work.
A polite request is asking their respective managers about the dress code and whether it can be relaxed. Creating a petition, circling it among the entire intern group, and essentially demanding change at a place that was generous enough to hire them for a learning experience is not a polite request. I interned at four separate companies when I was younger. I would have never even conceived the idea of doing somethin…
Oh what a load of crap
Generous? Companies use interns for cheap labour (sometimes free). There's nothing generous from their part