Is this a bad sign?

If your boyfriend doesn’t want to ever hear about your family drama? First of all he knows I love my family, but everyone knows some members of my family, like one of my siblings, should have their own reality show lol... I dont vent about my family members a lot, usually very rarely. I’m not annoying about it I think I’m quite normal when it comes to it. And some of my stories are funny. Just something to talk about really. And a way for him to get to know them better since he doesn’t know any of my family very well. Or if say one of my siblings did something extremely rude. But my boyfriend will usually just stare at me and not give me a response. Or he defends whoever I’m talking about, even if they did something really rude or ridiculous. He’ll tell me to stop talking about it. And I’m just like... but I want to talk about it. But on the other hand he vents about his sibling and thinks that’s fine, so why can’t I?