Sparks flew on this afternoon's Liveline after host Joe Duffy roared at a caller who branded another woman a "homophobic feminazi".
The normally mild-mannered presenter lost his cool after a caller fired the accusation at fellow guest Laoise during a discussion on plans to install unisex toilets in schools.
Laoise was speaking against the proposal while the other caller was in favour of the emotive topic.
Laoise raised concerns about trans children using unisex toilets, using the term "trans identified boy" rather than using the term "trans girl" in an example she gave to back up her point.
The other woman called this an "insult" and added: "I think that woman [Laoise] is from the 1940s or something, what's going on?
"Seriously Joe, that's ridiculous. This woman has been given a platform and to be honest with you I think she's coming across, and this is just my personal opinion, she sounds like a homophobic feminazi."
The last remark didn't go down well with Joe, who blew his top and angrily shouted: "Bye bye. No! None of that language on this programme. None of that language on this programme. Stop it."
The show then cut straight to an ad break and when it returned, the other caller was no longer on the line and the host issued an apology.
He said: "Laoise please accept my apology, I did not know that was coming.
"I thought that was an outrageous use of language. Nothing you have said on this programme so far would lead anyone to use those phrases so please accept my apology."
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