"You are absolutely right" is one of the main catchphrases in "The Unbelievable Truth" with David Mitchell.

Maybe it is a UK thing?

https://en.wikipedia.org/wiki/The_Unbelievable_Truth_(radio_...

I love that BBC radio (today: BBC audio) series. It started before the inflation of 'alternative facts' and it is worth (and very funny and entertaining) to follow, how this show developed in the past 19 years.

You’re absolutely right, we use that phrase a lot in the UK when we emphatically agree with someone, or we’re being sarcastic.