Was flying the British flag upside down a deliberate insult?

At the King and Queen's state visit to Arlington Cemetery, you can see a soldier behind them holding the British flag upside down. Some say it was an innocent mistake, others a deliberate insult.

But what's your thoughts?
Was flying the British flag upside down a deliberate insult?
Childish soldier who thinks the war of independence is still relevant
Major diplomatic gaff but we should be grateful at least they got the right flag
Trump's trolling again
An unforgivable direct insult and the king should have declared war
Make the soldier do 1000 press ups while singing God save the King
Select gender and age to cast your vote:
Was flying the British flag upside down a deliberate insult?
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