Diplomacy deeply flawed

[God Emperor]

In the Last few games I have played, I ended up in Trade Alliances, Trade and Research Alliances or Partnerships with all of the races, but, a number of them had a "murderous" attitude to me despite giving resources and techs as gifts. What is the story? Why are they so upset?

In the games I was top of the ladder, with more tech, ships, units, planets and systems than any other player. If this is the reason, surely they should be more obsequious rather than "murderous" - particularly as I hadnt gone out of my way to upset anyone - eg I didnt lay claim to any contested systems and tried to avoid building in contested systems.

[Instar]

Sometimes when you're beating the AI scorewise, they get jealous. I think that might have been the "Mega Evil Empire" effect.
The AI is pretty decent, but I don't bother really. Usually they refuse most of my treaty offers, and I end up killing them off. I think its usually the Mega Evil Empire thing though, I was doing great at the time.