Let The Druid go.

You tried to please this player and it didn't work. You can't please everyone and life are too short for both of you to play games you don't like.

If you still want to have The Druid as part of the group, have a chat about how you feel about the comments regarding the old campaign. It might be that The Druid miss the old group, not only the old campaign. Maybe bringing it up every session is a sort of coping mechanism for not meeting that group regularly anymore. The hard part here is to express that stories about the old campaign is welcome, complaining is not.

Another possible tactic to explain that the old campaign is not repeatable is to bring up examples from media you are both comfortable with, comparing, for example, two movies or authors that are both recognized as good but have totally different tone (my example: Terry Pratchett and JRR Tolkien). The emphasis here on that even very experienced and talented people in the same area are not copies of each other.

Let The Druid go.

You tried to please this player and it didn't work. You can't please everyone and life is too short for either of you to play games you don't like.

If you still want to have The Druid as part of the group, have a chat about how you feel about the comments regarding the old campaign. It might be that The Druid misses the old group, not only the old campaign. Maybe bringing it up every session is a sort of coping mechanism for not meeting with that group regularly anymore. The hard part here is to express that stories about the old campaign are welcome — complaining is not.

Another possible tactic to explain that the old campaign is not repeatable is to bring up examples from media you are both comfortable with, comparing, for example, two movies or authors that are both recognized as good but have totally different tone (my example: Terry Pratchett and JRR Tolkien). The emphasis here is that even very experienced and talented people in the same area are not copies of each other.