No idea how you can compare a Blinding Dart or a Shroom to a Janna tornado/heal/monsoon, Soraka heal+armor buff/silence/AoE heal, Sona's heal/MS buff/AoE stun, etc. Also Teemo without items is useless, hence he's a bad support.
Also, you can say the same thing about Teemo's skills to Morgana's Dark Binding+ultimate, Galio's shield+ultimate, Nidalee's heal, etc. Having utility on a champion doesn't make him a support. Being useful even without items does.
Please stop trolling and than getting mad that others are mad at you for trolling, that's just perverted!