Memory Alpha calls Comi's character Stiles; Styles was the guy in Star Trek III. It would have been less confusing if they'd given Styles a different name.
I don't think Comi's Stiles was prejudiced against Vulcans. He hated Romulans due to ancestors/relatives killed in the Romulan War. His animosity toward Spock didn't really start until they'd tapped into the Romulan bridge and learned of their resemblence to Vulcans. He apparently thought Spock was some sort of spy, which makes no sense because Spock was the one who tapped the transmission in the first place.
This was a bit of continuity that was lost, as a part of the scene with the outpost commander was cut, where Hansen says to the effect of, "Copied our designs....spies...." when the warbird shows up again. THAT'S why Stiles makes the spy insinuations later, as they see what a Romulan looks like.