The Millers manager was returning to Massimo Cellino's club for the first time since his summer exit and he was not allowed in the official car park.
But Redfearn got his own back by masterminding a first win in charge of his new club at the seventh attempt as Joe Newell's second-half header sealed a superb 1-0 success.
Redfearn's time with the Whites last season was blighted by off-field issues, which included Cellino calling him "weak" and sacking his assistant Steve Thompson from under him.
And the Italian's latest stunt did not impress him.