So, here is the actual Title 4 wording. It seems to only apply in the District of Columbia. Note also the very last sentence.
TITLE 4
§ 3. Use of flag for advertising purposes; mutilation of flag
Any person who, within the District of Columbia, in any manner, for exhibition or display, shall place or cause to be placed any word, figure, mark, picture, design, drawing, or any advertisement of any nature upon any flag, standard, colors, or ensign of the United States of America; or shall expose or cause to be exposed to public view any such flag, standard, colors, or ensign upon which shall have been printed, painted, or otherwise placed, or to which shall be attached, appended, affixed, or annexed any word, figure, mark, picture, design, or drawing, or any advertisement of any nature; or who, within the District of Columbia, shall manufacture, sell, expose for sale, or to public view, or give away or have in possession for sale, or to be given away or for use for any purpose, any article or substance being an article of merchandise, or a receptacle for merchandise or article or thing for carrying or transporting merchandise, upon which shall have been printed, painted, attached, or otherwise placed a representation of any such flag, standard, colors, or ensign, to advertise, call attention to, decorate, mark, or distinguish the article or substance on which so placed shall be deemed guilty of a misdemeanor and shall be punished by a fine not exceeding $100 or by imprisonment for not more than thirty days, or both, in the discretion of the court. The words “flag, standard, colors, or ensign”, as used herein, shall include any flag, standard, colors, ensign, or any picture or representation of either, or of any part or parts of either, made of any substance or represented on any substance, of any size evidently purporting to be either of said flag, standard, colors, or ensign of the United States of America or a picture or a representation of either, upon which shall be shown the colors, the stars and the stripes, in any number of either thereof, or of any part or parts of either, by which the average person seeing the same without deliberation may believe the same to represent the flag, colors, standard, or ensign of the United States of America.
AMENDMENTS 1968 - Pub. L. 90-381 struck out "; or who, within the District of Columbia, shall publicly mutilate, deface, defile or defy, trample upon, or cast contempt, either by word or act, upon any such flag, standard, colors, or ensign," after "substance on which so placed".Interesting: can't display a hint of it, no matter how favorably, in relation to anything which could be construed as advertising, but with deliberation the legislature removed any prohibitions against malicious mutilation thereof.
Well he vaguely understands there is some law about that sort of thing somewhere.