The mere fact you think the entire "creative industries" are "still hundred percent exclusively Mac" tells me you haven't seen much your whole life, apparently. So you've played around in your town's local studio and they've used Macs your entire life? That must be it since your statement is almost 100% false. Hey, I like Logic Pro and unlike video editing, it doesn't "need" to be updated constantly to be useful. Skilled musicians should be able to work with an analog tape multi-track to record something if necessary. High tech tools just make life easier. But video editing is a time issue. It's a whole different ball game. Apple USED to be popular in a lot of areas, but that was long ago when Windows was total garbage. Apple used to be known for its graphics. No longer. Now it's known for phones. Yes, there's still plenty of Macs out there. But it's nowhere NEAR 100%. That statement is absurd.
I totally agree with this. In the early days of computers making their way into studios there were quite a lot of particularly smaller studios, who were using Atari STs. I'm within a year of the age of the guy you're correcting, and my experience is nothing like his. There'a a real mixed bag of hardware floating around these days.
Same goes for the creative industries as a whole. Apple screwed the pooch in the professional market by virtually hanging a huge sign from their HQ saying: "PRO USERS - YOU ARE LITERALLY AT THE BOTTOM OF OUR LIST OF PRIORITIES". Steve Jobs achievement in turning around Apple's fortunes was amazing. But in turning the company into a mobile device vendor, he stuck his middle finger up at the industries that had basically kept Apple alive during the lean years.
I even wrote to him about it (and got one of his famous one line email replies).