Drunken Humor

So please tell me why I go out with my boyfriend when he drinks heavily? I am laughing and socializing with a cousin of his when all of a sudden he comes over. He claims to only be drinking beer but by the sound of his "jokes" I can tell hard liquer has played a part. He says to us hey, what are you guys plotting? She responds, we are planning a breakfast together and then shopping. His response, whoa, it's not even Halloween yet! He immediatly begins to laugh hysterically. The cousin and I look at each other confused. Confused, as to why this is so funny? I closed my eyes, shook my head and said huh, that's funny why? You know cause that's scary and Halloween isn't for a while. This will continue for the next few hours. As we're watching tv there's a special on about this woman who has 6 kids and he walks in on one of his many trips to the restroom. What are you watching? Oh, (a reference was made to someone with many kids) yeah, this is "Sally's" life. His response? That's the signature plan (he laughs out loud). This time she says what the hell are you talking about? I say, do you mean she signed her life away? No, signature plan. Okay, so now we're talking about plans? With that being said I decide to call it a night. I've once been asked "What's the deal with him?" You're funny, he's not. That is a reflection on you. Why does that haunt me so? The moral to this story? If you're funny don't hang with people who think they are. It will ruin your rep.