Mr Galloway was organised a show at Dudley Town Hall on Friday night in an event called George Galloway, Mother of All Talk Shows Roadshow.
But Mr Austin, the MP for Dudley North, claimed less than 200 people turned up to hear Mr Galloway in the 1,000-seat venue.
Mr Galloway was in the Black Country as he stepped up his bid to unseat Labour's deputy leader, and West Bromwich East MP, Tom Watson, in a forthcoming general election.
Mr Austin tweeted: “Humiliation for @georgegalloway from the great folk of the Black Country tonight.
He hired Dudley Town Hall – capacity 1,000 – and less than 200 turned up! Take your nasty politics of hatred, division and extremism somewhere else.”
Mr Galloway is a supporter of Labour leader Jeremy Corbyn - unlike Mr Austin who quit Labour due to Mr Corbyn’s leadership over what he claimed was a culture of “extremism, anti-Semitism and intolerance” that had developed in the party.
The now independent MP has also been critical of Labour MP Chris Williamson who Mr Galloway tweeted in support of after the show.
Mr Williamson was suspended by Labour in February over comments he made about the party’s response to the handling of anti-Semitism allegations.
After his show in Dudley, Mr Galloway tweeted: “I don’t know Chris Williamson very well but I’ll tell you this – the only crime he’s committed is to be the most loyal supporter of Jeremy Corbyn.
“But he’s being treated as if he’s a Nazi war criminal.
“This is a modern day Dreyfus Affair.”
“I don’t know Chris Williamson very well but I’ll tell you this - the only crime he’s committed is to be the most loyal supporter of Jeremy Corbyn. But he’s being treated as if he’s a Nazi war criminal. This is a modern day Dreyfus Affair..”#MOATS| #LIVE | Dudley pic.twitter.com/Vst8nbI0hR— George Galloway (@georgegalloway) August 9, 2019