Senior Sinn Fein TD Eoin O Broin has said that a party member who called to a young activist's house to tell her to delete critical tweets was "wrong" to do so.
Christine O'Mahony (22) quit Sinn Fein's youth organisation last week amid controversy over Sinn Fein TD Brian Stanley's social media post referencing Tanaiste Leo Varadkar's sexuality.
She also raised separate concerns about alleged racism in the wake of Mr Varadkar's claim that he's been the target of such abuse from Sinn Fein supporters.
Ms O'Mahony said a Sinn Fein member called to her parent's home while she was upstairs.
She said her parents were told she shouldn't be criticising the party online and her tweets should be deleted.
Ms O'Mahony told the Irish Times she made the decision to resign after this as she believes members are being "silenced". She also posted on Twitter "As a black and bisexual woman I can't stay silent on these issues. My principles before party."
On RTÉ's The Week in Politics former Belfast councillor Mr O Broin was asked about the issue and an "online pile-on" that Ms O'Mahony and the reporter were told her story were subsequently subjected to.
Mr O Broin said: "The people who were engaged in that pile-on did the wrong thing. They are not in any way aiding or assisting our party and if they think they are. My message to them is stop doing those types of things".
Mr O Broin added: "What the individual in question did was wrong. Nobody should have called to the activist's door. People should be allowed to engage in political discourse publicly as they see fit."