I hate to break this to you, but Tetley's IS tea. You may not like it, but that gives you no right to act superior.
If by "Tetley's is Tea" you mean it's made from dried black tea leaves, sure, why not.
It's not about acting superior. Your grocery store has much better tea brands than Tetley's. They aren't even more expensive than Tetley's. Heck, some might even be cheaper than Tetley's.
I recommended 2 to you. Try them and come back here and say "Tetley's just fine".