It isn’t a ‘Tee You’ (in caps) – it’s a Tu (pronounced ‘Too’)
From the name of the founder of the OKB – Andrei Tupolev.
The first two letters of his last name – Tupolev.

Same with Sukhoi (Su / Soo) – not ‘Ess You’.

You know i reckon there’s a touch too much sensitivity hereabouts. I read this with interest. It was news to me and I thought, well done that (flanker) man, for telling us.

And then a bunch of people get all bitter and twisted about it. WTF!

The (good) thing about this forum is that it’s a place to learn. Sometimes a poster will phrase things in a way that might at a glance be misconstrued, it pays to take a breath and see through that.