If someone had told me to get a CI to "improve myself" she or he would immediately get bitchslapped all the way to the moon and back. We're not defective or ignorant or criminal people or whatever who needs "improvements"...we're Deaf, we're not defective nor are we stupid nor are we criminals or whatever...being told we should get one to "improve ourselves" gives us the idea that there is something wrong with us mentally, that we are defective, and that there is something wrong with being Deaf. I didn't get a CI to "improve myself", I got one because I WANTED one. I have no need to improve myself, even without a CI...
Your husband's co-worker had such nerve to tell you that all Deaf people should get CIs to "improve themselves". That's very insulting.