Vandals attacked a window display that featured pro-LGBT T-shirts at the Silver Spring American Apparel store on Monday morning, The Sexist reports, shattering a window in the process. The Georgetown location of American Apparel also received a telephone threat later that day about their similar window display. The T-shirts in the window bore the logo of the company’s “Legalize Gay” campaign, which is designed to raise awareness about opposition to California’s Proposition 8. The…