Like MrThatsDifferent, when I first became interested in personal finance, I excitedly told everyone about my plans. I was basically Dave Ramsey's unpaid promoter. After a few years, that excitement wore off. Then I learned about early retirement, a concept I had never even considered. While I wasn't as...fervent as I had been with Dave Ramsey's stuff, I was still more than happy to share my plans to retire early anytime conversation remotely approached finances or the market. As a result, I've shared my early retirement plan with various friends, family members, and coworkers. I've regretted telling almost all friends and family.
When my wife & her siblings decided to get their mom wireless earbuds for Mother's Day, I suggested getting the same ones I had, which work just fine and cost ~$45. SIL is only willing to get Apple Airpods, because they're "the best." Instead of splitting a $45 cost, our share of the cost was now more than $45, all for a product that MIL will use for a few hours per week and eventually lose (scatterbrained, bless her heart). Before SIL knew that we saved half our income, we could just say that it's not in our budget to spend that much and be done with it. Now, if I say that, I'm a cheapskate.
The only people I haven't regretted telling, strangely enough, are coworkers. I usually get some follow-up questions after sharing my plan, so I think it has had a positive influence. I doubt it was anything more than curiosity, but I would like to think that those people decided to put some of that information to use.
One possible contributing factor to the different reactions I've gotten is the age difference. The friends & family I've told were all older or similar in ages to me, whereas most of the coworkers I've told were in a similar role to me, but generally 5+ years younger. I don't think that people like hearing
As I continue in my life, I'll probably save my sharing for people who are younger than me. I can hopefully reach more people around me as I age. When I actually FIRE, I don't think that I'll be able to avoid telling friends & family the truth. I'll probably lose a few friends along the way, and some people will probably continue to think that I'm very selfish. C'est la vie.