The only thing I can think of is that perhaps because he saw the woman standing right there he figured that she wouldn't be standing right beside where guys pull out Mr. Wang, so then it must not actually be for that.
But then again, I knew what it was as soon as I saw it... so... yeah, still
There used to be a big sign in a pub toilet in Dublin Ireland that read "Do not eat the big white mints" I never knew if this was for real or someones sick joke (ps the mints were urinal freshers for those of you who didn't get it)