Etiquette

Is it bad etiquette when someone invites themselves to your bday party and then you uninvite them giving them some lame excuse only because well, you're not really friends with them and aren't impressed that they had big enough balls to ask if they could come to your bday party.

I initially said yes, but the more I thought about it, the more it annoyed me and so I told them they can't come haha.

Whatever! It's my party and I think it's only fair I celebrate it with those I want there right?