"A bit of noise is completley normal" ??

I have a high end integrated amplifier. The input (source)selector switch on my unit created some audible static when I switched sources. While I had the integrated at the manuf. for an upgrade, I asked them to check out the source selector switch. After I got my integrated back from the manuf. one of their reps replied:

A bit of noise when you switch from one input to another is completely normal. After all you are switching contacts. The switch is fine.

That does not ring true to me. Do you consider "a bit of noise" in a switch from switching contacts to be normal? It's not normal to me. For me it meant dust is in the switch. Not satisified with that response.