you're right, no matter what they do, or in this case don't do, someone will be upset by it.
if they were to have celebrated all veterans from all across the world many people would still be upset by it.
im sure someone would say, "this is US Veterans Day, not global Veterans Day".
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In some countries it's called Remembrance Day or Poppy Day but it's still the same concept of veteran recognition/appreciation and it falls on the same day as US Veterans Day.