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After Never Mind The Buzzcocks host Simon Amstell made jokes about his wife Chantelle thinking M&S was upmarket, Preston wanted to thump him.
Instead he ripped off his microphone and walked out of the studio.
'I was very up for the kind of rib-poking that you get,' the Ordinary Boys singer told BBC Radio 1, 'but then he just started insulting my wife...
'If that was in any other situation I would have literally hit him and knocked him out.
'Obviously I didn't want to resort to those sorts of things, so I just had to remove myself from the situation.'
Preston, 24, hopes the walk-out will be broadcast because he is proud of his chivalrous behaviour and wife Chantelle – who he married in August last year – was very proud of him.
'She was really touched,' he admitted.