Pretty much everywhere was founded on colonial genocide...
It's just how recent it happened.
Like, you're giving America shit for what the English, Spanish, and other countries did before America even existed. But it's hard to really blame even the English. It was the English people doing it, it was their royalty who were French.
For the vast amount of human history, some random group you may never have even heard about could just roll up and conquer you and take all your shit.
The context of this image is that Europe is making fun of something uniquely American, so you would think that America would be making fun of something uniquely European. They are not.