Sugar will dissolve in unsweet tea, it's just slower. If you can't dissolve it in cold tea, then it wouldn't stay in solution in hot tea that was cooled down.
For someone complaining about northerners not knowing 9th grade chemistry, it sure sounds like they weren't paying attention themselves.
Chemistry knowledge! Sweet tea is actually a supersaturated solution. That means there more sugar in the water than could normally be held in suspension. This is achieved by heating the water so you can dissolve more solute in and then chilling it. Remember theres at least 2 diabetes worth of sugar per glass.
Where did you get that? It would be like honey if that was correct. Also, that is not called suspension but solution, since the particles dissolve (unlike fat in milk, but that is an emulsion since the fat is a liquid).
You're technically correct, but completely missing the point that folks want to be able to actually drink it a reasonably short time after it's been served.