The person who changed needs time to let the change become familiar to others.

People update their picture of you slowly. Whatever you have stopped or started, the friends and family around you are still working from an older version, and they will keep offering you the drink or the role that used to fit. This is not usually resistance. It is the ordinary lag between a change and its reputation.

If you have changed something, expect a stretch of being treated as who you were. Restate it calmly rather than taking each instance as a slight. Steadiness over a few months does the convincing, and most people arrive at the new version once it has been in front of them long enough.