No what you said wasn't stupid just because your opinion isn't based on experience yet doesn't mean it's not valid and of course after you have been there doen that, people's opinions still differ.
I think it was pretty rude of them to write off what you had to say but then that's family I guess, mine can be the same sometimes

Personally I'd take the VB anyday I had my VBAC in July, she was 10lb8, I had a 2nd degree tear which healed in a matter of days & it was waaaaay easier recovery-wise than my CS.
I know there are women who tear & it takes longer to heal, and there are women who have CS & find their recovery time quite ok.

As for it being a productive pain, absolutely!
I'd rather give birth than go to the dentist