Usually a DJ will request the file to import into the playlist so they don't get disruptions to playback from texts, phone calls, etc. I'd say it sounds like they found a polite way of telling that person "no".
I also wonder if anyone considered sending the media over another protocol. There's BT, NFC, IR, MMS, OTA, Wifi, sharing sites, etc. And if the DJ had 1/4", XLR, USB, HDMI, optical, SPDIF, or RCA, then they'd still have needed adapters, splitters, or converters.
None of my audio equipment has 1/8" inputs, so I'm about as sympathetic to the universal argument as I was when cars stopped having CD-audio players and roughly as optimistic in our ability to get over this as a people.