How do I politely reject a friend wedding invitation?

RSVP : No

Tell him you are unable to make it because of other committments but feel honored and appreciate the gesture

Go. Maybe you'll like it. He obviously thought of you. That means something...

Tell them you have a family event on the same day... (like an anniversary)

set him up and just do not go.

accept invitation and just dont turn up

He's struggling to find people. Do him this one favor out of kindness.

tell him you're washing your ear hair

It is ok to decline. Previous commitments

Thank you but i have other plans..

RSVP that you will not attend.

Don't respond

I have the 24 hour bubonic plague?

just say youre not really friends and you want him to die