I'm not a young guy (you and I are probably around the same age). I don't preach or do the tireless work of ministry. I'm a layman with a family, regular job, etc.
I think you have a point that younger men are heavily invested in polemics and speculative theology. So when a pastor comes online with applied theology, or a pastoral point derived from our dogmatics, they can get pushback from younger men who want to hear how this point gets developed metaphysically or from within the traditional sources. And that can be frustrating when you are not trying to get into scholastic disputes and just do the work of a pastor.
It's worth asking why younger men are interested in polemics and dogmatics. It's easy to write this off as cain speculation or making an idol of the intellect, but I don't think that's what is going on.
Guys under 30, and especially under 25, have grown up in a completely different digital world than we did. Even the Young, Restless, and Reformed trends were tethered to publishing houses and parachurch associations that moderated content and distilled it for the masses. If you're, say, 22-23 years old, you've been in a world where medieval treatises of theology were translated by Claude in 20 minutes, fully searchable, and with additional tools to help you understand them. You have probably watched several of your friends, whether in real life or just in online spaces, leave the Reformed faith and go to Rome or Orthodoxy. And you feel pressed in by the challenges of these factors.
When I was a young man and deeply invested in my studies (at that time, it was in reading Berkouwer, Thomas Oden, Pannenberg, etc), I had pastors that asked questions about what I was studying and why. They took an interest. They tried to understand. They then recommended to me spiritual texts that weren't dogmatics, but were for the flourishing of my inner spiritual life. I listened to these pastors. They affirmed my intellectual pursuits and guided me gently towards sources that would sustain me after I had worked out the scholastic answers.
I had another pastor who showed no interest in this. He even mocked it as vain. Looking back as an older man, I can see this was his defense mechanism for the fact that the study of dogmatics didn't interest them and they didn't like the challenge of a young guy with some knowledge. At the time, it was confusing and hardened my heart to what he had to say. And within a year, I ended up a Papist and stayed one for about 8 years (I haven't been for some time now).
The point of all this is: when a young man tells you "you don't know theology", it's worth asking how he (and we) got here, when you should take this seriously, and when you can - as a pastor- help to shepherd their souls. In my experience, if you just write it off as youthful intemperance, you'll miss some lessons that will benefit them (and you).