If by "you" you mean me, this has become rather personal.
I didn't claim to be "leftist". I'm not "glorifying" anything. I'm not sure what you think I'm "refuting".
If by "refute phenomenon (sic) that have been taking place for thousands of years" you mean "racism" I'm not refuting the fact that it exists, what a strange claim that would be. I don't really follow what you're saying here at all.
I certainly didn't claim that Brexit voting patterns describe (do you mean explain?) the rise of pan-European nationalism. So again I don't follow what you're saying here.
In fact, I believe quite the reverse direction of influence: that the rise in pan-European nationalism influenced a vocal minority of the vote who now feel legitamised.
I suspect that the rise in pan-European nationalism is due to people being worried about recession, austerity, crumbling national institutions, etc etc. and immigration has become a surrogate for that: There's only so much cash in the coffers; there aren't enough {houses,schools,hospitals,whatever}; immigrants consume a non-zero fraction of these resources; therefore reducing the number of immigrants will improve the capacity of these services.
The problem being, of course, that you could pick any scapegoat and substitute it into that equation equally well. Consequently, when people do pick immigration as their scapegoat of choice, I consider that xenophobic.