my dh would rather stick pins in his eyes than attend a kid's birthday party, or any other party for that matter. he did, however, clearly survive our wedding reception, so don't fret about that.
I'm a miserable old grump anyway, so personally can't see the point of a birthday party for 2 year olds. Won't they be too young for games etc? Waht do you do with a bunch of 2 year olds? SUrely the'll just play, fight cray and eat a bit. And all the mums will be there, in which case, I don't understand why df needs to be there too?
So I'd say, given I've had to suffer countless parties unaided (but for 5,6,7 year olds) no yanbu and it's a pain, but given the circs of a room full of screaming 2 year olds + mums, I can fully appreciate why he doesn't want to be there, so yes, yabu
No way would my dh be at something like that either. not in a million years.