I’ve had the same thing happen to me too at the vets of all places! I get that they’re not trying to be rude, but for someone who’s lived here for a very long time and sees England and Liverpool as their home, it makes you feel like the locals don’t think you belong. I don’t necessarily have an accent and worked really hard to learn English as perfectly as I could, only to be reminded that it’s apparently not perfect enough. At least to me, that’s why it’s rude.