Hi Brian,
Yep, I got that lecture too, from another tea nut. I'm not a big green or white tea drinker, so I don't need to be too persnickety about the temperature. They're right about the timing, though. It's a fine line to walk to extract the optimal amount of flavor (vice tannin) for the tea in question.
My other strange complication is that I burn my tongue really easily (and get nasty black marks from the scorching, and pain that lasts for days!) so I need to cool my tea down significantly before I drink it. Thankfully, there is a hvac vent right next to my desk that pours out enough cold air to chill a cup of tea in no time flat.