It's a big problem when we think that everyone would love us unconditionally, not minding our darkest sides and moments. Humans are indeed different. We cannot be the same way. The way A would love and accept you for who you are will be different from how B would see it.
It becomes a problem for us when we think generally that everyone should love and accept us irrespective of who we are because not everyone would have the ability to tolerate things the same way.
It is rare to see someone who would stick closer to you apart from your family who will never disappoint you whenever you need them to accept you.