onomatophobophobia
The fear of phobia names, especially long or unnecessary ones. An irrational aversion to the habit of coining words for ridiculous and improbable fears.
Mary's onomatophobophobia means that she collapses in a panic attack whenever her husband reminds her about his hexakosioihexekontahexaphobia.

Pete was enjoying reading comics until he came across the word luposlipaphobia and his onomatophobophobia kicked in, leaving him dizzy and nervous.