A hotel I visit sometimes is currently advertising a 'High Tea' for Mother's Day. The menu is sandwiches, quiche, scones and cakes. But that's not 'High Tea' is it? That is an 'Afternoon Tea'. A high tea where I come from is a late afternoon meal like a 'proper' dinner - meat, veg, potatoes etc. of some description.
The hotel do brand themselves as being a bit top tier. It irritates me that they are calling it a 'High Tea' as if they are being too posh to do an afternoon tea or something. And don't get me started on the whole 'cream tea' debacle!
YANBU - it's afternoon tea - they are unreasonable to call it a high tea.
YABU - it's a high tea/who cares what they are calling it!