I feel the same as you, and I think it's worth thinking about. At the risk of sounding very "get off my lawn"-ish (I'm only early 30s!) I think it's related to

I feel the same as you, and I think it's worth thinking about. At the risk of sounding very "get off my lawn"-ish (I'm only early 30s!) I think it's related to the fact that our lives are now giant public soap operas being played out in social media for everyone to see. So the swearing at a person in congratulations is telling that how an envious external audience member would feel about their accomplishment, while the person you are swearing at takes absolutely no offense and is very complimented.