Many people drink tea not from tea bags to the point that "many" isn't really descriptive enough. If you're a tea aficionado, you definitely don't. Which means there's an entire market of people doing things like an aficionado even if they are not; see audiophiles. Only mass market large brands push the tea bag. Good tea comes packaged as loose leaf meant to be used in whatever strainer you have.

I never eat or drink anything heated in plastic when I can control it. Sure it may have been stored in plastic at some point, but not heated.

>I never eat or drink anything heated in plastic when I can control it.

Do you avoid restaurants and cafeterias completely?

Restaurants, etc use stainless steel for heating, not plastic. To-go containers often have plastic and should be avoided but should not get to their melting point.