Billie Joe Armstrong Joins A’s Fans In Reverse Boycott, ‘Sell The Team!’

Oakland Athletics fans flocked to the Coliseum on Tuesday to hold a “reverse boycott” against the franchise’s plans to move to Las Vegas  … and the movement got support from one major supporter — Green Day frontman Billie Joe Armstrong!!

More than 27,000 supporters — the biggest crowd of the season — filled the stadium to prove to A’s owner John Fisher they still support the ball club … and many wore shirts calling on him to sell the team.

Of course, A’s fans have been fed up for years … with the A’s front office seemingly giving up on any hopes of being legit contenders by shipping away young stars and having the lowest payroll in the league — resulting in poor attendance records at home games.

Now that Fisher has kickstarted the relocation process, the larger-than-normal crowd of A’s fans showed their disproval as their beloved team played the Tampa Bay Rays … chanting “sell the team!” and, at other times, giving the silent treatment altogether.

Armstrong — an Oakland native and longtime A’s backer — was among the fans in attendance … and he was all-in on the cause, posting his support on Instagram.

“Oakland forever, Vegas never,” the rocker said. “#selltheteam.”

BJA was super friendly with his fellow A’s fans … posing for selfies and chatting amongst the crowd throughout the contest.

The A’s continued their current winning streak by winning the game, 2-1, but things got ugly shortly after the final out … with some spectators throwing trash onto the field.