When your SO isn't so great at kissing down there 😕

How would you ladies discuss to your SO with a huge ego that he's not so great when he tries to kiss it down there 🙀. He loves to do it, and he does try all the time but It's just not doing it for me. 😐 if I don't talk to him about this the right way, every thing will go left and I'm sure he isn't even going to want to have sex for a while, he's so sensitive 😒. How do you hype his ego when your giving negative feedback