Of course you SHOULD be able to tell someone you're offended without the risk of backlash, but it's always a risk. Clearly Adria decided to handle that risk in a different way than you or I would have.
It doesn't mean she isn't grown up though as this is just one non-representative tiny slice of two people's entire lives. Honestly, I didn't get a chance to update my message, but another question (seen here and elsewhere) is probably more important: "Why isn't the story about her life being threatened over this?" That's the more ridiculous part of this story.