Err, yes we do refer to male politicians as ‘Mr XYZ’. Here’s a random story I picked from the BBC News site today:
Anti-Semitism row: John McDonnell would welcome Labour probe
10 March 2019
Labour's John McDonnell has welcomed a potential investigation into allegations of anti-Semitism in his party [...] On Friday, the chair of Labour peers wrote to party leader Mr Corbyn to express "alarm" at the "ongoing failure" to resolve the issue [...] Asked about the investigation, Mr McDonnell told BBC One's Andrew Marr Show: "I'm hoping we will get a clean bill of health about how we are handling things. [...] The Sunday Times has reported claims that two of Mr Corbyn's closest aides had intervened in the party's disciplinary processes to lift the suspension of an activist accused of anti-Semitism.
I’m just looking at the top political story on the Mail Online right now and it also refers to Mr Corbyn, Mr Rees-Mogg, Mr Cox, Mr Juncker, Mr Barclay and Mr Boles.