This is indeed a sign of poor judgement on behalf of their presenter. I very much doubt if he would make a 'eurofag' or 'euronigger' joke, but for some reason it is considered acceptable to use derogatory language about people with disabilities.
However, this probably isn't the biggest problem about representation of people with disabilites in the media. When was the last time you saw a deaf person, or a blind person or a wheelchair user in a mainstream RTE drama or comedy? Better still, when was the last time you saw a disabled person on RTE where the topic was not about their disability? Can you recall ever seeing a disabled person getting laid or getting rich or getting fired or getting snappy with their partner, i.e. being seen on an equal basis to those around them? Wouldn't that make a pleasant change from the tragic/heroic storylines that seem to be the only chances a disabled person gets to appear on RTE?