Other Sims join conversation when your Sims are on date

I agree. I get that sims are social but this is way too much and totally not realistic. Your sim doesn't even know the other sim(s)! I can understand if it is at a club or a bar, where being social is natural, but at a restaurant - no one goes up to a stranger's table and strikes up a conversation while they are eating! It's weird, even for the sims!