To a degree, you can't really help who you like. What is wrong is to hate other people, particularly if they never harmed you first. It is okay if you will never be best friends with gay people, and you should never beat yourself up over that. However, do try to be polite and civil with them. Most are just trying to live their own lives, and they are not out to ruin yours.
People dislike gay people because they are different. It's a simple matter of prejudice.
being gay is ok
No, it's not "ok" to call people gay.
Some do, but most don't.
Firstly it is not true that all straight people dislike homosexuals. To have gotten that impression you are mixing with the wrong people.
Gay men do not dislike lesbians.
Yes, gay people are perfectly okay in public.
Yes, Hitler disliked gay people, and put them into the same sub-human category that he put Jews into.
Gay intimacy between two consenting adults is perfectly okay, as long as you are practicing safe sex, and you live in a country that allows freedom for gay people.
Yes it is okay to be gay and there is nothing wrong about it.
It's okay to be a gay anything. You shouldn't be worried about other people's views.
As a general statement, the question is incorrect and is drawing a stereotype (i.e.: a wide general conclusion not based in fact). Police officers dislike Gays in no greater proportion than that of the general population.