We all know such situations are not easy to handle. Normally I just look at the person and wait until the insult is over. Sometimes I feel rising heat inside and notice that as “heat”. I understand the person in front of me as “having bad gathi and no control about”.
If the offense is too strong or hurting, I directly say “(please) stop shouting!” or “you shout at me, do you realize that?”.
The insult triggers certain gathi in me but mostly I can catch the manosankhara before I say something bad. Of course not always. It also helps when I speak slowly and think slowly. The process remains more under control.