I think a lot of people say this because they are uncomfortable about the alcoholism..to a lot of people it is the skid row bum. They don't want there to be a problem. Some people don't understand or are scared of what it means. Then some people say it because if you have a problem with alcohol then maybe they have a problem too and will then have to address it. A lot of people, most people, are uncomfortable with change. You will change. But it is for the best.
You know to what degree you have struggles with alcohol. It can be frustrating to talk to people about it. Many are well meaning but don't know the right thing to say or do. Some want to sabotage your efforts. You will be able to sort them out. Educate the former and avoid the latter.