Is there any secular reason why being gay is bad?

[kılıç_mehmet]

On the same accord, being deaf or mute isn't unfortunate either, yes?

Being deaf or mute is unfortunate, since you are either missing a valuable sense or way of communicating. Being homosexual does not make your life harder because of who you are or who you love, but generally because of bigots like you trying to give them a hard time.

We're also giving thieves, murderers, traitors, provocators and other people the hard time they need.
No one is a unique snowflake here. Those who live in harmony with the normal majority deserve the right to respect, those who don't, deserve only the hard stick on their backs.