I'm laughing like hell, but in sympathy with you. As an old fart, retired commercial shooter, I can say without doubt, that's a client you don't want. His request to see your gear would be only his first unreasonable request. That's a client who has absolutely no idea what he's doing, what he needs or what he wants.
I once had a client who wanted to visit my studio, apparently to make sure I had one. During his studio visit he wanted to know where I did my processing, what film I used and why I didn't shoot 4x5 Kodachrome since the K'chrome he shot as a hobbiest 20 years before was so good. BTW, he wanted B&W images. When he asked if my 15 foot studio ceilings were high enough to "really do pro work", I excused myself saying my "darkroom timer was vibrating". I stayed away until he left.
That's a client you do not want!
My place