The holoboyfriend was indeed a "whaaaa?" moment. There's a line, people! The line between holographic sex toys and holographic significant others! Please make sure you are on the correct side of this line!

The J/C aspect didn't bother me, because I was raised on Riker/Troi, and therefore tend not to be threatened by extracurricular sexual activities especially when he's a hologram, so it's not like he could marry her and give her babies.

Yep. It's like Kate Mulgrew mouthed off to the producers one too many times and they suddenly started taking great glee in making her do batshit crazy things.