The guy's opinions are well known, he has ably and assiduously promoted them and he has repeated his central theses quite often in widely-read publications and widely-watched news shows.
Guess what, bud?
A lot of people have listened to what he's said and disagreed with what he's said. A lot of people have read his opinions in their newspaper or magazine and disagreed with what he's written.
That's life.
People interpret Buchanan based on their own prejudices. Using exact quotes and references from his ample article writings would be the best evidence of his socialism. What some call 'socialism' others call 'fascism' depending on their preferred smear term. So without quotes it borders on bullsh!t.