Xykon feels every wizard looks down on him.

It is start of darkness, where the "Wizard >>> Sorceror" idea is consistedly presented; as a very common yet still personal opinion, and it is always said in the presence of Xykon, so in all cases it could be meant to insult the specific sorceror Xykon.

Maybe it is just a lot of wizards overestimate themselves; With few contact you don't learn to appreciate others well.

V is happy with Jephton being spliced upon her. Jephton, Haerta and Ganonron seem to work together well and respect each other.

V is very hostile to but not condescending towards Samatha and the Black Dragon, at least not due to their sorcerer levels.
In oots 677, The drawmij messenger tried to find and use anti-sorceror prejudice in V. That didn't work. He had to resort to the warlock-insult.