The only flag allowed inside is the United States flag.
Not true...it’s up the the director:
“the display of any placards, banners, or foreign flags on VA property unless approved by the head of the facility”
http://law.justia.com/cfr/title38/38-1.0.1.1.2.0.6.12.html
Besides...one cannot make a serious argument that the stars and bars is a FOREIGN flag...
Wanna bet if the guy was gay and wanted a rainbow flag there wouldnt be a word said about it?