The right to marry & form a family is a fundamental human right enshrined in the Universal Declaration of Human Rights (Article 16), and the equal right to access to, and protection by, the law and all parts of it are enshrined in the nation's constitution.

Opposing those rights without a single rational justification for that opposition, is an act of irrationally discriminating against (or seeking the discrimination against) homosexuals.

The definition of homophobia (Merriam Webster dictionary) is as follows:
IRRATIONAL fear of, aversion to, OR DISCRIMINATION AGAINST homosexuality or homosexuals

If the action meets the definition of homophobia, then the action is homophobic.
The only possible way to change that fact is to redefine the word homophobia and get the new definition of the word accepted and adopted by a sufficient proportion of the population to warrant the redefinition being adopted by each set of authors & editors of each version of the dictionary