Legolas is not the Heir

[The Squatter of Amon Rûdh]

Boromir knows a bit about Lorien, why given the fact that the Last Alliance had to be major history [not too mention Galadriel's aiding the ride of Eorl] was Boromir anti-Lorien? just general
'red-neckedness'?General distrust of all not Gondorian inherited from Denethor?

I find it significant that Boromir never mentions Galadriel by name when voicing his distrust. I think that the dangers of Lórien are soldiers' gossip, of which he would have had more of an opportunity to partake than serious historical study during his many years of fighting for Gondor.

We should also remember that Boromir isn't studious or reflective like his brother. He'd know about the major events in the history of Gondor and of his own house, but not the less publicised details. Perhaps Galadriel's rôle in these events wasn't common knowledge, or perhaps it wasn't widely known in Gondor that she and the lady of Lórien were one and the same.