I lost some drinking buddies, but then again all we had in common was alcohol so I really didn’t lose much there. Certainly I had a few close acquaintances from my regular drinking establishment that I still occasionally see, but I knew them from outside the drinking world already.
But if someone were to hold my sobriety against me and not want to be my friend because of it that says a lot more about them than me. And I would have no problem moving on without a second thought.