The answer varies. Even with the aspects we need to change, an attitude of tolerance makes the changes more feasible. Intolerance simply adds another layer to the problem, a layer that perversely serves to prevent any change in the thing we cannot tolerate in ourselves. For example, if we need to lose weight and we have an attitude of disgust toward our overweight body, the disgust itself may drive us to eat more than necessary. If you can truly tolerate, accept, and embrace yourself, you may then hope to become more tolerant of others.
Intolerance breeds hatred and violence.
Milder forms merely waste our precious energies and keep us mired in its poison. Giving up an intolerant attitude toward others is actually a great gift to ourselves. Intolerance toward individuals or groups, whether of another religion or race, or just someone who has bad manners, saps our spiritual strength. But, we re not able to just decide to be tolerant of others. We need to see intolerance whenever it rears its head in us.