I beg to pardon - It's when an Englishman says, 'Could you repeat that?' like

It's when an Englishman says, 'Could you repeat that?' like he just got insulted by a very posh person.

'I beg to pardon? Could you repeat that?'

'I beg to pardon? I didn’t quite catch that.'

He asked, 'I beg to pardon? What was that?' as if it was a major insult.