Acting Prime Minister Winston Peters says Opposition Leader Simon Bridges made a fool of himself by labelling Prime Minister Jacinda Ardern and partner Clarke Gayford “pinkos”, and said the baby would be going to school in boys’ clothes because of its parents’ politics.

“I think the Latin phrase would be that’s a res ipsa loquitur situation – the thing speaks for itself,” he told journalists at Monday’s post-Cabinet news conference.

“When someone makes a fool of themselves? Do you want me to elaborate my views? I think the thing speaks for itself,” Mr Peters said.

Res ipsa loquitur is a doctrine in the law of torts that says the incident was of a type that doesn’t generally happen without negligence.

Mr Bridges has…