Eh, labels are useful. I don't believe that saying "left/right wingers tend to X" means "the world is black and white" or "everybody is left/right wing and that's all you need to know about them". It's how you use labels that matters. And yeah, a label can get misused so bad that it loses its usefulness in honest discussion, but I think "left/right-wing" is far from that death. It carries too much useful meaning when thoughtfully applied.

Even accepting that "left wing is a tribe", summarizing the views of a tribe (especially in relatively objective terms) isn't the same as engaging in tribalism.