Ex-Miami Marlins president David Samson egged on hecklers at a party this weekend ... flipping off the crowd, bragging about his team's sale and then screaming, "F*ck you!!!"
It all went down at ESPN personality Dan Le Batard's birthday party in Miami ... where Samson -- one of the biggest sports villains in the city -- got up onstage for a speech.
The dude -- who many blame for making the Marlins a mess and forcing city's taxpayers to foot the bill for their new stadium -- was boo'd relentlessly before he could even open his mouth.