Here's a story about Radical Candor from our evangelist Joe Dunn. Remember that Radical Candor Challenges Directly and shows you Care Personally. Often, you can establish a relationship of caring personally over time, and that will naturally show through in the moment you deliver feedback. You can emphasize this by offering feedback in a spirit of helpfulness.
https://youtu.be/5gVUkb71WJY
For more tips on giving Radically Candid feedback, check out the following posts:
Video Tip for Radically Candid Criticism
Video Tip for Radically Candid Praise
A HIP Approach to Feedback