Why do Irish Travellers call themselves gypsy?

i was just wondering i am an Actual gypsy (Romani) and i was watching some YouTube videos my friends has sent to me and it was My Big Fat Gypsy Wedding i was thinking wow Maybe we'll know them let me watch, then they turned out to be irish travellers when irish travellers are NOT gypsy but they just act like us allot i dont know why though, but irish travellers are NOT NOT NOT!!! gypsy's they just act like it so what i wanna know is why do they act like us for?