Well if that's what they're doing, I don't see it as racist.... so long as they have the same equal rights and equal chance to change things like any other citizen can through the right processes, there's no room for complaining.
The moment someone breaks the law and justifies it as part of their culture, they know damn well it's against the law, thus they lost any rights to complain, culture be damned.
But, say the immigrant is doing something perfectly legal that's based on their own customs, and someone complains or tries to force them to not do that thing (when they're legally allowed to) that's where I draw the line and that person's cultural differences should be protected.