You can not love others if you don't love yourself.
But loving oneself does not mean being narcissistic.
Narcisism is bad. It means self absorption and self obsession. It means not being able to be able to love others as one is too obsessed with oneself.
The problem is that self-absorption and self-obsession is a subjective criteria based on judgement. Who is to determine want constitutes too much "self-absorption" and "self-obsession," or even that these traits are "bad"?