I can't deny it, it does irritate me that they go out of their way to try and play down the rivalry. I know I shouldn't let it irritate me, because in many ways I'm playing into their hands but I can't help it.
I'd never realised that Sunderland fans not regarding it as a derby was even a thing until I first discovered the RTG forum back in 2013. We were struggling under Mowbray at the time and they regularly had threads on there where they'd belittle us, and say that Boro have never been a derby game to them.
Maybe in some ways, this highlights why some of them don't see it as a derby, because I haven't actually met many Sunderland fans throughout my lifetime. Maybe some of their fans not seeing it as a derby has always been a thing, but I'd just never realised it because I've never really known any Sunderland fans.
I get the feeling though that it stems from that period when Sunderland and Newcastle were both in the Premier League and we were in the Championship. The Sunderland/Newcastle rivalry intensified further, and we became the forgotten cousins up the road, who they looked down upon.
Sunderland had a big thread about us on their board over the weekend. Most of them were saying they were pleased for us and wanted us to go up, and of course one said that this highlights why it isn't a derby game, because if it was Newcastle they'd be desperate to see them fail. I couldn't help but feel it was easy for them to have this attitude though. If they looked a good bet for promotion and we didn't many of them would be mocking us.