The AI will now declare wars based on hatred, i.e. extremely low diplomatic relations. The wording of the text will vary based upon the power differentials between the two empires. If the AI is more powerful, expect to get told something along the lines of you being a nuisance and getting crushed.
Below is a screenshot of the Silicoid diplomat declaring war against an evenly-powered player. Note that the holographic area now has a waving flag for the empire in question. I overhauled all of the flag animation code to now draw everything programmatically. This is going to give me a lot more flexibility in adding more flag designs and shapes over time.