That yellow Godzilla banner is a familiar site and the woman in the blue jacket appears to be holding up an "MVP" sign. We'll give her the benefit of the doubt and assume that there is more it than we can see.
Two guys who don't appear to be Japanese are holding up the flag of Matsui's home country. Probably big fans of his looking to show their appreciation. That's an awfully nice gesture.
I don't think using the fictitious solicitations of a prostitute from a movie is the best way to convey to Matsui how much his contributions to the franchise meant to you, unless you are propositioning him for sex on behalf of the entire fanbase. And by the way, Full Metal Jacket was about the Vietnam War, you dummy. Hideki Matsui is Japanese, remember? Can you see why some people might find that offensive? No? Do I have to get Gunnery Sargent Hartman to explain it to you, maggot? BULLSHIT, I CAN'T HEAR YEAR YOU!
Is this guy an insensitive asshole who is making a somewhat racist joke? Just a clueless moron who doesn't know the origin of the reference? Some combination of the two? So many questions...