Answer: It is most reasonable to conclude that Brad is HOMOPHOBIC.
Explanation: Homophobic is relating to homophobia. Homophobia can be defined as the dislike of, fear of or having an adverse knowledge or opinion of individuals having sexual and/or emotional attraction towards members of the same sex. Which can be any one of the LGBT. Lesbian, Gay, Bisexual, Transgender/Transsexual (community).
From the definition above, it can be deduced that Brad is homophobic because, he hates homosexuals which is illustrated in the definition as dislike. His orientation being predicated to fear.