I have to deal with someone in my life who firmly believes that the more I exercise now (while pregnant), the healthier and more predisposed to exercise the baby will be after he's born. As in, my workout somehow gives the fetus a workout and a healthy mindset.
Yeah, that's not how it works.
I have learned to just not respond at all beyond saying "Yep, exercise is a good thing." (FTR, this baby is FAR more active than I am, he never stops kicking and pushing and spinning around in there.)
Doesn't it seem like the most poorly informed people have the loudest opinions?