Donald's past experiences with naga's haven't always been the most... Positive. So it's understandable that he would take Konoha's small gesture of affection the wrong way. Don't worry Konoha, he still likes you, just warn him about your surprise hugs. He will warm up to your kind.

Just a silly picture from Urban Chronicles.

Donald is my human persona.
Konoha is my hognose naga character