What is the legitimate Islamic response to someone who describes a woman who uncovers her face as lacking honor, and her husband as a cuckold, bearing in mind that she follows a specific jurisprudential school of thought, and that most Muslim women in Egypt and the Levant uncover their faces?

This statement is false and reprehensible. The issue of a woman covering her face from non-mahram men is a matter of scholarly disagreement, and this disagreement is permissible. To describe a woman who uncovers her face, and her husband, with offensive epithets is an excessive and blameworthy exaggeration. Advice should be offered gently, not harshly.