“So, all you do is push the play button then”
Well, unless that’s what you do, he doesn’t know how hard it is to keep the music playing without breaks for a couple of hours running.
To the crowd, a DJ is simply someone who plays music. How they do it is irrelevant. Only a DJ can understand the difficulty of another, so I would say there is no point arguing with him. Not because he is correct (he’s definitely not) but because you will never make him see this fact.
Don’t waste your time on him, instead make a mix and post it in the Music and Mixes section of the forum so the people who ACTUALLY know their stuff can offer you valuable assistance and feedback.
Hope I helped!