Somehow, per Bump, characterizing your opponent, based on facts that are not misstated, is a dirty trick.
I'd like to see him try to apply that logic to all the candidates. You're a blustery blowhard if you portray Trump as a blustery blowhard. Etc. etc.
Is this the old takes-one-to-know-one/he-who-smelt-it-dealt-it rhetoric we all learned in childhood?