Comment by meheleventyone

You could look at being in a relationship and making that decision as an achievement. Although most of the reason for congratulating the couple is to show support. Otherwise you’re just being opinionated about how much effort is deserving of being worthwhile. Which is fine as long as you accept people’s reactions.

Like you could decide nothing short of an Olympic record is worth congratulating but this is pretty obviously very socially inept.

Edit: Basically on aggregate there is nothing special about it but it’s important to the people involved and how plussed or non-plussed you feel about it should relate to your relationship with them rather than how impressed you are personally about it.