A Gypsy is a Romany Gypsy. They do not sound Irish.
A traveller is what was called an Irish Tinker. They sound Irish.
Hate to disagree with you again Perry, but I have lived in the same village as travellers for a year, have friends who live right next to Dale Farm and also know 3 'settled' families. They live pretty much exactly as portrayed, except there are a hell of a lot more fights, and violence towards the women.
The 3 settled families I know are all Romany. They have integrated and they look down on the travellers as they cause them so much grief.
One of the pubs featured in MBFGW is not that far from me, and very close to where my DSis lives. Their weddings/functions are exactly as portrayed, if not worse.
They are a nightmare at the races, I've been in Epsom when they have had to shut pubs for miles around so that coachloads of travellers can't cause trouble. That's not from prejudice, that's from going on experience of what has happened in the past when a coachload has descended.