Everyone sees your bases, and from them they assume what your build cap is.
Unlike the real world, where you can hide a troop buildup,you really cant in the game.
And based on the knowledge avialable to the AI about your bases, i agree with and support the "hate this guy" attitude of the AI due to build cap.
I do however think its needs to be adjusted and have some other factors added in that have their own measurable weight in the mechanics of the "time to hate this guy" AI mechanics though.
And yes, some emails from the AI asking "Hey man ! Just why ARE you building those 500 tanks units !? "
Ya know, we dont have the highest of trust between us, so i am afraid im going to have to consider that those tanks your building just might be meant to be used against me , AND so im just going to have to dislike you even more
.Unless of course you can give me some diplomatic reassurance that that isnt the case."
Kind of things.