It was called "[Warstrider][1]", by Ian Douglas! I clearly remember the cover having the word "Xenophobe", big and bold, on the cover, though, along with a huge black/silver alien thing looking like the creatures from Pitch Black, bearing down on a guy.

Humans had nanotech films on their brains for interfacing with computer systems, eastern culture had become dominant, the aliens used Silver Surfer-looking nanotech mechs that split into smaller mechs once defeated and at some point, humans came into contact with a third alien race using biotech that also wanted to help defeat the antagonist aliens. The ending had a twist about the true nature of the attacking race.

The reference to *crunchies* is when Corporal Castellano tells the main protagonist Dev:

>"The poor bloody infantry, sonny. Crunchies, the striderjacks call 'em,'cause that's the sound they make when their CAs get stepped on by the big five-meter jobs."

  [1]: https://www.goodreads.com/book/show/553590.Warstrider