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.