Bloody hell OP, you've posted this so many times (and yet, say anyone who mentions Irish Travellers is derailing)
How can you identify a white traveller from a group of white faces?
I've answered before. Not everyone can, that's true. I think I could. I'm Irish, used to seeing and living near, Irish Travellers.
They are ethnically distinct, so do look different. They also largely marry within their own community so that increases their ease of identification.
I confess to feeling quite furious that you keep challenging this - it's so prejudicial of you.
Perhaps you might not see the difference, as you know little about Irish travellers. I would.
Many Irish people (which is where most Irish Travellers live, in Ireland) can.
A traveller walks up to a shop; they don't have to say anything. They are refused admittance.
They go to book a wedding. They've a 'typically' Traveller name. (Something you mentioned in relation to black people, so you should get this). They won't be allowed book a wedding.
These things happen because in Ireland (UK too but I don't live there) people can recognise Travellers & in some cases, treat them badly just because of that
For example (and this will chime with you as you used the exact same example talking about racism against black people), if there's a crime, it's so typical, still today, for someone to say 'oh that was the tinkers' (the derogatory name used to refer to Travellers, tho originally it wasn't at all - they were tinkers as they mended pots & pans etc, 'tinkered' and some Travellers still use it. But it's not broadly considered acceptable)
On my neighbourhood what's app group the other day, someone posted there was a dodgy looking Traveller (they used another term I won't write here) around the estate, and to keep an eye on property, check windows / doors. When I objected, I was shot down & told that these were helpful posts to safeguard the neighbourhood.
I don't imagine you know much about this. That's fine. But God, can you just stop with the 'how do Travellers look different to other white-skinned people'
For once on these threads, can you accept information given to you?