The 63-year-old was dismissed earlier this month after nearly two years in charge at Loftus Road.
During that time Warnock guided the R's from the Championship to the Premier League.
"I know the influence [chairman Tony Fernandes will] have had from certain people over the past few weeks," he told BBC Sport.
"It would have been difficult to resist because people get on the phone and tweet and it's almost like slowly poisoning somebody from outside the club and no doubt from within the club as well.
"It's a dangerous precedent. If you let players talk to the chairman but, you know, you can't stop tweeting."
Mark Hughes was appointed as Warnock's successor two days after his sacking.