Our kids drink a lot of tea, they get a lot of weird looks from strangers and questions from friends/family but I'm okay with it. Most of the time it's herbal tea, but if I'm having a regular tea or coffee for that matter, I see no issue with them having some.
I was rasied with the "caffeine is bad for children" concept, and told it stunts growth. So I never ever EVER had caffeine and I'm just a little over 5ft. I've also spent a lot of time in the company of Dutch immigrants whose children drink coffee all.the.time and their kids don't seem to be stunted at all

I do take into account if the tea or coffee has caffeine, what time of day it is etc. before giving them anything, same applies for juice too though - they rarely get juice.
So long story short, in my opinion it's not horrible for a kid to drink tea, but you can encourage herbal or very watered/milked down tea to reach a compromise
