It is probably more common than most people realize, but not talked about much. I know two women who took some time to bond with their newborns because their labours were very traumatic. On the other hand, mine was, but I didn't have any difficulty bonding. I'm not sure what that proves.
One of the two women I know who had difficulty bonding doesn't like to talk about it because she believes it reflects shamefully on her. In her words, "what kind of a mother doesn't love her baby right away?". Well... I'd think, an extremely traumatized one (in her case), or one who may have addiction issues, or other problems. I'd think there are quite a number of good reasons.
BUT.
Your mother's inability to bond with you does not, in any way, reflect on you. I'm so sorry she seems to think "you're a loser in her eyes". How awful for you. Maybe her inability to bond with you prevents her from seeing your undoubtedly many lovely qualities. But that is not your fault. It is her skewed perspective. So if you can, please don't take on her view of yourself. How could you, as a tiny newborn baby, be at fault for her not being able to bond with you? You couldn't.
Neither does her failure to bond with me have any predictive value for your future children. In fact, if anything, you'll be more sensitive to your babies, when you have them, because you know what you've missed.
for you. Don't allow her to embarrass you like this. If it were me (and I realize you haven't asked for advice on how to respond but I am giving it anyway because I just realized I'm not just for you but also ), I'd say, "Mum, the fact that you couldn't bond with me, regardless of the circumstances, is not my fault. It reflects more on you than on me. I'm sorry you feel I'm a loser but you don't need to broadcast it in front of everyone, so please don't do it again."
Grrr.