Most of the people on HN will be fine; we'll be alive, we'll still have jobs, and we'll have food and energy albeit at a higher price. Our societies may end up a bit poorer and the standard of living will probably be on a level that your grandparents had in the 70s.
Hundreds of millions of other people will be less fortunate.
Aside from just counter-arguing your point which is easily brushed off, I want to ask a genuine question - What about this dialogue makes you skeptical? What's your view of what's really going on? Politically or otherwise.
Most of the world's major population centers are near the coast. With significant sea level rise, those people will move. We're not merely talking about millions of refugees here, but possibly a billion. Put your mind to work and imagine what that will do.
+2.5C increase over tens of years, as predicted? Very different story.