It's partly coz of Teni's character and the fact that she is worshipped and never been considered wrong and also the way Bhanushalis and Cvs worship the very ground ahe walks on. In the initial days, I genuinely used to like Teni when the triangle wasn't started.
Though her accent and her acting was the same since beginning of the show, it never bothered me much before. But the way her character shaped up, now it's so annoying to watch her, can't even tolerate that face, that accent or those actions more than a few seconds.
I saw the segment you mentioned, the way she tore the paper while muttering those dialogues , I felt the same way as you , like wish we could tear her apart in a similar way😆... The frustration basically comes only coz in spite of her actions being unfair and hypocritical, she never realised that she is wrong.