If saying no makes someone upset, that’s their emotion to handle—not yours.
You are not responsible for managing other people’s reactions to your boundaries. You are only responsible for honoring your own needs.
Let people adjust. Let them feel however they need to feel. But don’t shrink yourself to make others comfortable.
Not everyone will understand your boundaries, and that’s okay. Boundaries are for you, not for them.
People who benefit from your lack of boundaries will be the most upset when you start enforcing them. But that discomfort? It’s temporary.
Protect your peace. The right people will respect your limits.