ばか！バカ！　馬鹿ー月！

I'm not blaming the traslator but isn't the author wrote a lil too many times yare yare in kyon dialog? (My, my as traslated)
Anyone willing to count them I bet there are at least 5 times in 50% already...it's funny and sad becasue kyon becomes too much sarcastic already in this 50% volume, he's really irritated I suppose, I wish he would snap it will be cool.

I am the translator in question.

haha I did notice it. in my copy it is written as "阿阿..." and this phrase did appear quite a few times.

guess it is the author modifying his writing style.

yea thought so, the author became a little sloppy, or he intended to take kyon sarcastic remarks somewhere...or to show something.
I hope kyon will have a little more balls to stay firm about his ideas/ideals.