This seems to be another "talking past eachother" moment
@LonelyWolf999, obviously some Lords exist which
do view trade as worthy of extreme contempt, with people of higher social standing getting paradoxically
more contempt if they are seen as too involved with it. The only cases where this wraps back around again is when you
literally cannot afford under any circumstances to make an enemy, with Tywin Lannister, Corlys Velaryon, and others who are
monumentally influential and powerful being too big of a political threat to treat lightly, in contrast to Walder Prime who is powerful enough to garner resentment but low enough in social standing to take constant and visible blows to his rep.
And some obviously view trade in more practical terms, certainly not as good a way to earn your standing as being smart, or more popularly good at fighting or tactics, but politically advantageous knowledge all the same... so long as you keep it
quiet.
Just because the plurality of "all Westeorsi Lords worth mentioning hate trade and are repulsed by those involved in it" isn't true, doesn't mean that isn't basically the
social climate you aren't facing. It
is.