'Millionaire Matchmaker' Suit: Your Show is Trash!

Some guys who own a building are pissed off that it was featured on "The Millionaire Matchmaker" ... they say because the show is "trashy." As for the host, they say she's "crude and sexist."

The owners of the Venice, CA building claim in the lawsuit filed in L.A. County Superior Court and obtained by TMZ ... the prior owner made a deal with the show in 2007 to shoot the exterior, to make it look like the action on the show was happening there.

The plaintiffs say they bought the building in 2008, painted it, and were shocked to see their fresh facade on Seasons 2 and 3.

The new owners say they don't want their building associated with "a trashy show."

To prove the show is trash, the plaintiffs quote host Patti Stanger -- also a defendant -- making lewd comments, such as, "The penis does the picking" and "One good orgasm, and it destroys the entire bunch."