The Wynn Hotel's pissed its X is being whored around Washington, DC -- totally disrespecting their 21-year relationship together ... according to the hotel's new lawsuit.
The Wynn -- which owns XS Nightclub at Encore -- is suing XS Nightclub DC for using a similar logo. According to docs, the Wynn says it's had the XS rights since at least 1996 to market its restaurants, bars and nightclubs ... in this case a club at Encore.
The Wynn says the DC club is misleading customers into falsely believing its club is connected to the Vegas resort -- and, despite a warning back in May, it's still using the logo.
By the way, for its grand opening, the DC joint used the exact logo from the Vegas XS.
X's ... can't live with 'em, can't trust 'em not to hook up cross-country.