I was gonna say what Readyatlast and Mecanix have already said, that actions speak louder than words, and that people will take you seriously in time. Y'know this place is the only place I have been able to find unconditional support.
I think that our difficulties with other people getting sober has to do with our expectations. It would be nice to have unconditional support and understanding from others but the fact is they are often to tied up with their own stuff and their viewpoint is tainted by their own expectations and concerns. It is why most people's reaction to someone saying they are going to get sober is a negative one, not because they don't support you, but that they are worried they will have to do the same.