The United States were not the aggressors but the victims (putting it simplistically), much like Ukraine is. In the moment, Americans wanted allies to help them hunt down terrorists who committed, supported and/or funded 9/11. France was not the most willing ally and thus Americans, for better or for worse, became somewhat anti-French. The "Freedom Fries" craze was in-name-only though; it's not like McDs or Burger King literally renamed or stopped serving fries.
> "In a 2005 opinion poll by Gallup, participants were asked if they felt the renaming of French fries and toast was "a silly idea or a sincere expression of patriotism;" 66% answered it was silly, 33% answered it was patriotic, and 1% had no opinion."