Well, judging people is wrong but in this case you're just making an observation and forming an opinion...and I totally agree with you.
Someone I know just had a baby and while his GF and child were STILL IN THE HOSPITAL, he was at the studio with my kid brother recording a track. (And this was more of a hobby endeavor, not like they're making money off of it or anything.)
If my OH pulled a stunt like that, I would slice him from neck to nave (verbally, of course...)
As far as the guy who threw the party; to play devils advocate, all I can say is that guys can get very excited about their bundles of joy and can be down right inconsiderate in their celebration of new life. My OH had everyone at his job rubbing my belly when I came to meet him after work. No warning, he'd just introduce me to people and tell them to touch my bump. It was weird.