Depends
Xenophobia is the fear of perceived outsiders
And from fear blooms hatred, a natural human emotion, but whether it is considered bad or not depends on how it is expressed and its consequences.
Now Xenophobia can overlap with racism and discrimination against foreigners and outsiders and basically against everyone who is not them but not necessarily do so
As for warlike nature?
Again, depends or maybe no
To be warlike is not necessarily bad or evil in itself, but like with xenophobia it is depends on how it is expressed and its consequences.
We can do better.