That's perfectly understandable, to not understand what it is to be gay. Because your brain is wired to be attracted to women. In the same way, most gay men cannot understand the attraction of women. We are attracted to men in the same way straight men are attracted to women.
Despite what some uninformed and over-opinionated people have to say, being gay is not a choice we make. The only choices we make are to
accept being attracted to men and not fight it or hide in the closet pretending to be straight, and to have sex or not have sex (remain celebate) with men. There is no choice to be gay or straight. If a straight man does not make a choice to be straight, how can anyone in their right mind think that there is something special about gay men that gives us the choice? Does not make sense.
That gay men don't bother you, and you have gay friends says you are comfortable in who you are and that someone else's life and sexuality doesn't make any problems for you. I think most people feel that way too. I think most people just don't care whom we sleep with or live with as long as we are happy and loved.
People that are concerned with other peoples' sexuality and personal lives have something lacking or some defect in their own lives and sexuality.
As you blokes say: "Cheers, mate".