He's over-reacting, treating a trivial issue as if it were a major problem. (He's making a mountain out of a molehill.) SOURCE: Stutchkoff, Der Oytser fun der Yidisher Shprakh. Compare:
Er makht fun a vort a kvort. | .ער מאַכט פֿון אַ וואָרט אַ קוואָרט
He's making a quart out of a word (a mountain out of a molehill).
SOURCE: Bernstein, Jüdische Sprichwörter und Redensarten