A woman romantically linked to the far-right UK Independence Party (UKIP) leader Henry Bolton was suspended from the party after offensive text messages she wrote about Prince Harry's fiancee, American actor Meghan Markle, were published on the Mail on Sunday.
Mr Etheridge said he was not passing judgement on 54-year-old Mr Bolton's private life but on his professional performance.
Following The Mail's report, Miss Marney released a statement, saying: "I apologise unreservedly for the shocking language I used".
"It is quite apparent that he does not have the experience, the nous, or the correct advice to deal with the issues that he faces".
"The time has come for Henry Bolton to resign as leader of Ukip".
Party chairman Paul Oakden said: "In light of messages that have been brought to my attention, I have taken the decision to immediately suspend her party membership pending an investigation".
In Ms Marney's messages, which she sent to a male friend just three weeks before starting her relationship with Mr Bolton, she sneers at Harry's engagement to Los Angeles-born Markle - who will marry Harry on May 19 - on the grounds that she is a "black American". "Ukip does not, has not and will never condone racism", he said.
The party chairman, Paul Oakden, said the leader had "some hard decisions" to make. "He must go, he must go quickly, he must go as quietly as possible".
"She has to go or he and @UKIP are doomed if we let this behaviour happen in the party", the teenage activist said.
Peter Whittle, former deputy leader of Ukip, called for Marney to be permanently suspended, tweeting: "These are disgraceful remarks".
On Sunday he was accused on Twitter of being in Ms Marney's company when he appeared on television in mid-October.
When a reply to one of her messages suggested her comments were racist, she added "so what?" and said she did not want other races invading her culture.
Since the abhorrent nature of the texts were revealed, Marney has been suspended from UKIP.
Nuttall resigned after seven months following the Election, when Ukip's polled less than 2 per cent. Steve Crowther took over until Mr Bolton was elected in September.
She added: "The opinions I expressed were deliberately exaggerated in order to make a point and have, to an extent, been taken out of context".
Mr Oakden declined to give his own views on Mr Bolton's situation, but said the party needs to be "behind our leader 100% in taking that battle (for Brexit) forward".
After Marney's text publications, some UKIP politicians were calling for Bolton's resignation, Reuters reported. "But I think it's a very serious problem if it wasn't that, or even it was, it shows that we have problems in the system that can cause major disruption and panic and anxiety among people in Hawaii".