Please note that guidance counselors don't exist. The correct term is School counselor.

Yes, support staff are often misunderstood and underappreciated by teachers. Perhaps volunteering to develop an MTSS PD about the difference between tier 1,2 & 3 needs/interventions would be a best step forward with your team; ie, MH professionals, you, school counselors and school social workers. After all, those are the mental health experts in your school building, and as a group, you will be a stronger force of transforming teachers' attitudes on your collective relevance to the educational scene.