You’re not wrong, but you’re not a good teacher either. Rudeness and mockery don’t add anything, and in fact take away from your ability to inform people. You’re also only half right, insofar as nobody knows is a very accurate statement. You’re wrong however, that conservation laws definitely don’t apply. We just don’t know if they do, and there are reasons to believe (you reference Noether’s theorem) why they might not. The truth is, “Nobody knows” with a period and a full stop.

It’s also worth pointing out that universal expansion has an effect only on distance scales larger than galaxies. There is no reason to believe it will pull apart smaller structures, never mind subatomic ones. It’s a popular misconception that the expanding force is great on small distance scales. On the scale of a galaxy, that force is overcome by gravity, so needless to say the Strong force won’t even notice it.

Tl;DR Metric expansion is a powerful cumulative force on giant distance scales, weak on small (below galaxies) scales. Galaxies, stellar systems, stars, and Hadrons will be just fine, thanks.

If you’re going to scold people, you could at least be right. It is also a good idea not to rely on just YouTube videos for your arguments.