The blogger in question was web developer Jason Roe who believed he had uncovered a bug in the Ryanair online booking system that allowed consumers to book flights for a charge of £0.00.
According to the site , Roe received the following reply later that day:
"Jason! you're an idiot and a liar!! fact is! you've opened one session then another and requested a page meant for a different session, you are so stupid you dont even know how you did it! you dont get a free flight, there is no dynamic data to render which is prob why you got 0.00. what self respecting developer uses a crappy CMS such as word press anyway AND puts they're mobile ph number online, i suppose even a prank call is better than nothing on a lonely sat evening!!"
To this Roe replied: "I have not lied, I found a bug in your site that allows a user to see a 0.00 price listed beside a flight. Yes, I have cleared a session, but you have not prevented session jumping! I hope to god a Ryanair management type reads this.
"Crappy CMS such as wordpress .. its a blog? I put my mobile phone number online as im a freelance developer. At least I provide a phone number on my website, no premium lines here."
The Ryanair employee disagreed with this, making the following point: "Hehe -- I found a bug that lets me show anything I want on your site.
"All I have to do is put something along the lines of javascript:void(document.write('hehe')) into the address bar, and I can do whatever I want with your site ( or indeed any other site ). I'm not sure what you think you've achieved here -- that wouldn't have gotten you through to the back end. You wouldn't even have been able to enter passenger information.
"You must never have seen a decent exploit, if you think this is something worth bragging about. There is another exploit you could try -- wait until we're running a promotion when we give away a million odd seats for free anyway."
When Travolution tracked down the IP address of the poster and found it responded to Ryanair's offices it requested a comment.
A Ryanair spokesman, said: "Ryanair can confirm that a Ryanair staff member did engage in a blog discussion. It is Ryanair policy not to waste time and energy corresponding with idiot bloggers and Ryanair can confirm that it won't be happening again.
"Lunatic bloggers can have the blog sphere all to themselves as our people are far too busy driving down the cost of air travel."
The incident comes as Ryanair, which is Europe's largest budget airline, said it might start charging passengers for using the toilet while flying.
The announcement was made by chief executive Michael O'Leary, who said: "One thing we have looked at in the past and are looking at again is the possibility of maybe putting a coin slot on the toilet door so that people might actually have to spend a pound to spend a penny in future."
Leary said he did not see it causing an inconvenience to passengers: "I don't think there is anybody in history that has got on board a Ryanair aircraft with less than a pound."
Last week, Ryanair announced it was to allow passengers to use their mobile phones while flying.