If that individual's viewpoints somehow visibly leak into their work or professional communications, then you might have a case for complaint or concern.
Furthermore, by codifying and enforcing whatever your personal viewpoints are in a code of conduct, you've summarily decided for everyone else as well.
Also not sure what code of conduct you have in mind, but most specify that you should treat others with respect regardless of <list of protected characteristics>. That's not a viewpoint, that's a necessary condition for collaboration. If you feel an uncontrollable hate towards people of some nationalities or gender identities, it would be wise too keep it a private matter indeed, and not make this hate known to everyone
"Treat with respect" is a dog whistle - easily coopted for whatever nefarious reason.
"If you do not agree with me, you will not participate in any space where I can drum up enough sympathy (headache) to have you excluded from."