In Canada, a mental illness is classified as:

"Mental illness is the reduced ability for a person to function effectively over a prolonged period of time because of:

• significant levels of distress 
• changes in thinking, mood or behaviour
• feelings of isolation, loneliness and sadness
• the feeling of being disconnected from people and activities"

Homophobia (and transphobia) are though processes that can change your way of thinking and your behaviour towards LGBTQ+ people of society. You can feel disconnected because you do not want to associate yourself with people who are LGBTQ+. You can become distressed because you're trying to figure out if someone is, for example, a gay man, and if you should associate with them.

"Mental illness usually begins during adolescence and young adulthood. However, mental illness can be experienced by people:

• of all ages
• of all cultures
• from all educational levels
• from all income levels

Mental illness is not the same as feeling distressed because of normal reactions to difficult situations, such as:

• the death of a loved one
• job loss
• a romantic breakup
• a sudden change of circumstance

Additionally, there are several types of mental illnesses, such as:

• mood disorders that affect how you feel, such as:
  • depression
  • bipolar disorder

• anxiety disorders, which cause intense and prolonged fear that is not based on actual threat or danger
• schizophrenia, which causes mixed-up thoughts, delusions or hallucinations
• personality disorders
  • a type of mental disorder in which someone has unhealthy patterns of thinking, functioning and behaving
• eating disorders, which influence eating behaviours and are accompanied by negative thoughts about body shape and weight, such as:
  • anorexia
  • bulimia"

I believe that this would help with Homophobia, and maybe even Racism, because although they're against different groups of people, the people have the same characteristics when they're being discriminated against, and people can be from both groups at the same time. It would also be a way to reform people, how-ever bad that sounds, and maybe come up with a way to not have Homophobic people? It'd also be kinda funny so like, there's that.