Speak for yourself. I loved rockets[0] as a playful kid!
I played with Estes rockets too. How many people are likely to in war zones like these APS devices will be deployed in are likely to though? The rocket motors aren't super cheap and aren't really reusable or easy to make your own.
There's a huge difference between RPGs and hand thrown anti personnel grenades. The first uses a shaped charge to create a very directional blast of fast hot metal that can punch through armor and the latter is an unfocused omnidirectional blast that can't get through light armor.
'rocket propelled grenade' is a backronym.
Actually, looking at these sources, the non-propelled versions were actually called "ruchnaya protivotankovaya granata" ("hand-held anti-tank grenade"). Still the same acronym of course, it just doesn't include the launcher. So when the launcher part was added, the phrase changed slightly but the acronym remained the same. And it was only at this point that the phrase "rocket-propelled grenade" could be used to refer to this weapon, and the phrase was presumably created to match the acronym RPG.