The EU doesn't depend on the US to handle its foreign affairs.
Trump wasn't saying it as it is, because what he said is not at all the reality, since the other NATO countries don't owe anything even if they aren't at the 2% GDP, since that is absolutely not at all how things work (like not even fucking close), not to mention it was just targets and set for several years into the future and so on and so forth (been discussed to death).
Ukraine would have happened regardless, Ukraine is not a NATO member or an EU member, if it was it would almost assuredly resulted in a war between NATO the EU countries and Russia, which is ofc also why Russia was willing to do it in the first place.
How is the US having a deficit (which we are for some reason assuming its automatically bad) with Germany be at all Germany fault? It's not as if Germany is influencing the prices of USA goods.
EU gives quite a bit of money for foreign aid (several times more than the USA), supports other including the USA in their foreign conflicts (once again USA the only country ever to use NATO article 5), has taken many times more refugees than the USA (Syrian refugee crisis, have you heard about it?), and is engaged with the world, EU is one of the worlds largest economies, it was even bigger than the USA economy (from a pure GDP perspective) before the financial crisis, it is pretty safe to say any economy of that size isn't just "do head in the sand".
So yeah I see the tag is well deserved.