In the segment, titled “Classic Fourth of July Table Setting Ideas,” the network suggested viewers "drape a large American flag over the table as a bright and festive table runner."
The segment recommended using a "nylon flag so spills can be easily wiped off and the flag can later be hung with pride on a flag pole.”
http://news.yahoo.com/blogs/lookout/hgtv-american-flag-tablecloth-135533173.html
Yes this is constitutionally allowed, but common sense should say this is a very bad idea.