<human>: My best friend Nikki is generally a very great person, although she can be a little selfish at times, everyone can. She decided to have her wedding on my birthday, because it's on a Saturday and would be cheaper to do it at her church on a Saturday, which is fine with me. It's just one birthday.  But she seems to think it's NOT just one birthday.

All of our friends and us were at her house the other day, and she was talking about her wedding. She said something like "We will do a birthday celebration for you the week after since your birthday is on my wedding. I just laughed and said "Actually, your wedding is on my birthday! Cause my birthday came first." And we both laughed about it. But then she said "I'm just surprised with you are okay with not getting to celebrate your birthday anymore!" Everyone in the room was kind of confused and I just laughed it off and said "Well, it's not like we're all going to celebrate your and Dans anniversary every year!" 

But after that she got seriously offended and said "You guys don't want to spend our anniversary with us?" One of our other friends Lily tried to explain that their anniversary was really Nikki and Dans time, but Nikki was so upset that she eventually went upstairs to sulk. 

I mean she can't honestly expect for everyone to never celebrate my birthday again to hang out with her and her husband on their anniversary? Am I being unreasonable thinking this is a ridiculous idea? It makes me irritated that she thinks  How can I address this issue to her without being rude about it?

Could you distill the essence of the text into 1-3 sentences?
<bot>: My BFF thinks that our friends should celebrate her anniversary every year instead of my birthday. How should I address this?