I've been seeing someone for around 3 months. We've recently met each other's chidren, he has one DD aged 12 and I have 2 DDs aged 8 and 10. The first meeting we had was at a soft play area which we thought would be a good mutual setting. The day went pretty well although in the car on the way home his DD was continuously taking the piss out of my eldest DD saying some quite mean things but in a jokey way which automatically got passed off by her dad as "sillyness". I let it go but then the weekend after he invited us around to their house for dinner. As soon as we got there all the kids went to play outside, it was lovely and sunny and so we sat in the conservatory with a glass of wine each. But then every 5 minutes his DD kept running in saying my DD's had done this or done that or said this or said that. Everytime I went out my DD's were just playing and not knowing what the hell they had supposed to have done whereas his DD had a huge grin on her face at the fact that they'd been told off. So this particular night I'd literally been out to follow up on these "tales" six times. I went back in after the last incident and said quite stroppily "I'm getting a bit tired of this to be honest, it's constant" and he said "I know, I think they're just excited, don't worry about it" thinking I was on about my DDs when I was actually on about the tell tales. So i said "Well I'm not going out there anymore, I'm trying to relax, if there's a genuine problem they'll all come in, I'm sure." He agreed. So with that, his DD comes running back in saying my DD1 had swore. Her dad laughs and stands up and says "You better go and see what's going on whilst I get you another drink!". Anyway this pretty much continued all night until eventually i said it was time we were going home. On the way home my DDs were telling me absolutely nothing had happened all night other than his DD sitting there constantly saying "I'm going to tell your mum again that you swore/ hit her/ hit me / threw a stone " etc etc
He called me that night and said what a great night they'd had and he wants to do it again next weekend but did I want to stay over too as his DD would love to have a sleepover and it would give us more time together.
AIBU in not enjoying the whole tell-tale fiasco and in not finding it cute or sweet or funny or anything other than irritating and frustrating? if not, how do I bring it up without making it sound so negative against his DD?