My favorite floating plant is wisteria; hornwort is nice, too, but I think the wisteria is prettier. Both do well in low lighting.
Anubias and java ferns are great, as are Marimo balls (the easiest plants ever!). Amazon swords seem to do pretty well in low light (at least, mine seems fairly healthy) but they do need root tabs to feed off of. And, I've become quite fond of Aponogeton bulbs, or Betta Bulbs; I've got one in my community tank and am trying to sprout a few more. They're very cool looking.
The only cure for ignorance is education, and bullying or attacking someone is no way to educate them.