The headline is misleading. It implies that the account holder was asked if they were vegan or vegetarian. Many of the other commenters clearly interpreted it this way.

This is based on whether the user lists the information in their bio, so it’s not representative of the population. I suspect many users do not populate their bios at all.

I am a member of both, having recently joined Costco. I have been there twice, and so far, it seems about the same as Sam’s to me.