The Aviva Premiership outfit were the first sports club to announce that they would pay their respects to the former Prime Minister, who passed away last Monday from a stroke.
The club held a minute's silence ahead of their 47-17 win over Worcester Warriors on Sunday.
"It was a question of showing respect, not a question of politics," the Daily Mail quotes Griffiths as saying.
"In sport, we can suffer from the tyranny of the message boards, half a dozen people can create an impression that can cause a division.
It was impeccable. We have a good crowd and a lot of football clubs would like a crowd like that."
The Allianz Park in Hendon is close to Thatcher's former constituency Finchley.