Except as provided in § 46.2-2091, it shall be unlawful for any common carrier regulated pursuant to this article to make, give, or cause any undue or unreasonable preference or advantage to any particular person, port, gateway, locality, or description of traffic in any respect whatsoever, or to subject any particular person, port, gateway, locality, or description of traffic to any unjust discrimination or any undue or unreasonable prejudice or disadvantage in any respect whatsoever; however, this section shall not be construed to apply to discriminations, prejudice or disadvantage to the traffic of any other carrier of whatever description.