Examples of Homophobia:
It shows itself in many ways

Thinking you can "spot" one
Expecting gay or lesbian people to change their public identity or affectional habits or mode of dress
Changing your seat in a meeting because a lesbian or gay man sat in the chair next to yours
Kissing an old friend but being afraid to shake hands with a lesbian or gay
Failing to be supportive when a gay or lesbian friend is sad about a quarrel or breakup of a relationship
Worrying about the effect a gay or lesbian volunteer or co-worker will have on your programs
Not asking about a woman's female lover or a man's male lover, although you regularly ask about a husband or wife or boyfriend or girlfriend when you run into a heterosexual friend
Thinking that if gays or lesbians touch you, they are making sexual advances
Feeling repulsed by public displays of affection between lesbian women and gay men, but accepting the same affectional displays between heterosexuals as "nice"
Feeling that gay people are too outspoken about gay rights
Believing that discussions about homosexuality and homophobia are not necessary
Being outspoken about gay rights, but making sure everyone knows that you are straight
Avoiding mentioning to your friends that you are involved with a woman's organization, because you are afraid that they will think you are lesbian
Not confronting a heterosexist remark for fear of being identified as gay or lesbian
Using the terms gay and lesbian as accusatory

Source: