Half of what the sound guy said is true, and good advice: you do NOT want to rely on vocal monitors for your on-stage guitar sound and its necessary interaction with the guitar for an "alive" tone and controlled feedback.
The other half (nothing sounds as good as a well-mic'ed cab) is his opinion, and you shall stand by yours.
You can respond to him by saying that he misunderstood you, you do intend to have your own guitar monitor on stage, so no worry about point number 1. As for point number 2, tell him your only way to feed the desk is direct out of the Axe-fx, and it is the best there is, unparalleled. He is welcome to update his opinion afterwards. Metallica's sound guy is in agreement.
I have to say I agree. I saw Dweezil zappa use his FRFR monitor to great effect in terms of controlled feedback and his whole 'feel' while playing with the gain and its effects on the guitar (lots of effects in terms of 'feel' even way below actual feedback. of course). Virtually ALL of the guitar we in the audience were hearing was coming direct out of his Axe-FX and into FOH, and it was the best damned guitar sound I've ever heard! Given, this was a large hall with good sound reinforcement, not some dinky PA, but the it's still true that there were NO speakers facing us on the stage carrying guitar signal. Tell your sound engineer to go to a 'Zappa Plays Zappa' concert and shut up an' let you play yer guitar!
I don't get it. What is the difference between using the vocal monitors for your guitar sound or in ear monitors?
Ask him if he's seen those new phones they have now that don't need wires to work. Also, a man has been to space... and the earth is not flat.
There's still nothing like a real mic'd amp to pick up traveling sound waves, due to air moving from the speaker at different levels from each guitarists own unique style of playing. Add in room ambiance stage sound mic placement etc.etc.."
Good lord....
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When you say "we are using a new sound guy ", I take that to mean that YOU are paying HIM, correct? He's your employee, so why do you have to explain anything? You're the artist and this is your rig. "Sorry, but this is what I use. Let's make it work."