Kinnear, whose appointment as interim manager of the struggling Premier League club was greeted with shock, claimed he was upset at his treatment in the media.
And he hit out at newspaper journalists that he believed had ridiculed him and tried to undermine his position.
The former Wimbledon boss added: "I come from a one-parent family. My dad died when I was young and my mum brought up five on a council estate.
"There were an awful lot of characters at Wimbledon in the 10 years that I was there for it.
"There were things that had to be said and I don't know how to say them any other way than to tell them straight how it is."
Kinnear would stay at Newcastle 'for life'
Kinnear added that the international break has given him time to find his feet on Tyneside - and that he would stay at the club "for life" if given the chance.
"The break has given me the chance to get some key players back, like Obafemi Martins," he said.
"It's given me a good chance to take stock of what I've got, work with the players and get to know them better. I've got a good feeling about the place, too.
"Maybe I've brought new ideas into the club, but I like to keep everything simple.
"I'd stay here for life if I could. It's a massive club and I want to be part of it."
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