Travellers, to me aren't really an ethnic group. they are, in the main, a bunch of chancers who take all they can get their hands on, contribute nothing in return, and have latched onto the ethnic minority scam in recent years because its easy to use that to live how you want, get money for nothing and exemption from the norms and rules that apply to the rest of us.
I could accept it if they were proper old fashioned Gypsies who I used to see in Ireland, who lived outside society, but took nothing from it.
They just wanted to roam the country in their lovely old decorated caravans, and mind their own business.
They were also to be seen in various other countries too, but have all but died out in all of those places afaik.
They have been replaced by the new style Travellers, who often don't do much travelling , have pots of money (ill gotten gains) and are a blight on communities whenever they do travel.