It doesnt give you the right to insult players, taunt, etc.
Yeah, it does. Welcome to the majors, meat.
I've been to MLB games in 13 different stadiums. Every stadium has hecklers. I've sat in the bullpen area in Oakland. It's nothing compared to the Wrigley bleachers or the old Candlestick bleachers. A professional will ignore heckling, or even better, laugh it off and turn the crowd in his favor.
Regardless, it looks like justice will prevail. Francisco has already been arrested, and certainly will be suspended. He and his employers will undoubtedly end up settling with that lady for an amount large enough to remind them that professional behavior is important. Go A's.