Some of the side effects of overconfidence are rudeness, inability to listen or understand another person, abruptness of behavior towards other people, and a cocky attitude. There are many others. Sometimes loud talking or shouting also occur.
A few of the HMs are depicting these characteristics and perhaps they don’t realize that they are being shown as being so unlikable.
Paras, Mahira, Zari, and of course Shukla.