Question

Is it possible to make alters so angry/upset/hateful that they stop talking to the host?

yes for some peoples internal system of alters it is possible. for others it isnt.

for me it was possible....I had one alter that was not very forth giving with my therapist, this alters job was to protect the secrets. this alter got so angry at my therapist that she refused to talk to my therapist or anyone for months on end. I couldnt even hear her voice in my head during this childish "I wont talk to you no more" temper tantrum lol

eventually she had enough of the others telling secrets to my therapist, and went back to normal of protecting secrets again. lol

only you and your treatment providers can say whether its possible with in you.

in my experience, yes... a recent event tore right through us and all of the ones who were communicating with me, were very angry, because i had talked them all into telling someone that we trust. and they finally agreed... and then the event didn't go well, and we never fully got to tell the person, but a whole lot of other people found out.
Most stopped all communication with me. in my system and those people on the outside that was part of our support system. but in this i have also learned of another one who's been there but doesn't talk or share images or emotions.. she just doesn't trust anyone.. she has started trusting slowly.
so it may just take a while to show them that your sorry, or to get get them to trust again.