Calormans hate narnia because...?

Their Telmarines, not Calormans. The film doesn't explain this too well, but if you read the book Sopespian and Glozelle wanted to take over (just about every Telmarine Lord wants to do this) so by killing Mraz and beating the Narnians in battle they could then control everything. Theoretically at least.

In the book the metaphor is clearer. Tell marines represent human reason and invention--left brain powers. Narnia represents imagination and creativity--right brain powers. In Lewis' time, the Modernist movement was in full force. People were believing that they could control all of nature and fix any problem with the power of science and reason. Imagination, beauty, naturalism, environmentalism, these were all qualities that were very much scoffed at. In the book, the Telmarines were deathly afraid of the woods and especially the sea, which are both Jungian symbols for the unconscious realm, where creativity resides.
And yet, Narnia always needs a human to rule it, or it falls into chaos, which is symbolic of how we need reason and the conscious mind to guide and channel imagination and the unconscious. But not in a way that is domineering.
Basically, the message is, by trying to control all of nature and our deeper nature, we end up destroying the life that makes it magical. Not sure if I'm writing this in a way that makes sense...

basically if humans can't control it they destroy it