You are 100% not unreasonable to state your objections. It sounds totally unsuited to a residential property with neighbours.
It sounds as if there will be numerous vehicles coming and going, noise, environment impact.
Find out what grounds for objection count. Find out what your local Development Plan is, you can ask your planning department what categories of development are allowed in your area.
I would object in as detailed way as possible. And probably seek expert advice. Would any other neighbours be affected? Team up.
Anyone intending to do anything like this should be expecting objections.
Would they need a public performance licence?
If they take it personally and get hugged up, so what? Are you supposed to accept their plans and smile and nod?
Planning laws are there to make the process objective. Either it is approved within planning law, or not. But you need to advocate your position.
Do you research, put in an objection, and I would ask to present your objection to committee, too. Look them (planning committee) in the eye.
Public meetings might be suspended at present. Your local Cllr will be aware of local applications, tell your Cllr about your objections.