Fear and isolation - we don't have to do this

The world in which we live in seems to have turned into some unrecognizable clump these days. The world politics in general (some kind of clash of civilizations as Huntington the scientist put it) aside, rising nationalistic tendencies are creeping me out big time. This is not a happy topic in general, but it needs to see the daylight for that very reason.
Growing up in Finland, an unspoken solidarity between "us Europeans", especially the northern countries, Germany and maybe the benelux sector on top of that, was somehow always there. At least luring in the background if not admitted. It was us against them, the others being from further away - in the sense of culture, religion or map.

I've now lived in Germany for a year, and a huge layer of the society today seems to think it's Germany against everyone. Germans in Germany, the ideal situation, everything else is unnatural. You can fool the pattern by speaking perfect German. Otherwise you are in a wrong place. It is not natural to move that far from where you were born. This is how I've seen it.
During the elections in a tram, a man giving out brochures said we are "ok people, just in a wrong country". A colleague a lot like me calls the officials speaking obviously foreign German, mentions her (freaking good) position in a pharmaceutical company and gets a reply of "OH you have a job? OH. Oh." And to me the nastiest of them all: someone vandalizes my letter box name tag. Twice. Obviously I have a foreign name. German flags in private balconies. Someone yells "hau ab" (=leave) when I'm on the phone speaking Finnish.
Then there was the Brexit. The same old unhappiness with the situation of refugees and economy, only this time chanalised more chaotically than "just" one right-wing party hybris in one round of elections. Some days after the vote a Finnish girl working as a bartender in Wales encounters a well-dressed sober young man questioning her right and abilities (foreigner and all) to pour pints in a british pub. All the leave voters are not racists, but everyone who is a racist, probably voted for leave. Probably also the person behind the idea to laminate signs encouraging certain EU originated immigrants to sod off, as the UK is leaving the EU.

It's not that the majority of one kingdom is racist, it's just the ones that are, now seem to think half the country agree with them.

Old idiots affected the lives of so many

In Finland they already started an initiative to organise our own referendum, "fixit". The dude who started it argued: "Look at the other areas outside EU, their citizens' life there seems to have worked out just fine." Well, only limited people assume that somebody's life merely takes place inside the country they were born in.

I am so far from understanding this logic of "us against everyone" and "stay put where you come from" that I don't know what to think. Normally I detest racism, now I just feel like this is another planet and I want to go back to how things once were, or at least seemed to be. I want to point out that there is no reason to isolate yourself from other nations, the people are often very much like we/you are. This is a realization you usually get if you've spent time abroad yourself. From a pedagocical standpoint I think someone should catch this ball. Nothing feeds the attitude of patriotic solitude more than unawareness. If you never left your home village, you might just end up laminating insults. We need more international work shop days in school, more comparative religion/international relations experts in work life, more exchange programs already at younger age and just more positivity and love.

Just look at this, and tell me you agree with me - borders between us are actually often just fake: