How to tell nicely that you dont want to go somewhere because of a certain person

[Agent]

So, my mom and I've been planning a cruise trip on a boat. So, my mom really wants me to come too. But now she informed we are taking one of his friends with us and I think that her friend is really annoying and the trip wouldn't probably feel like the same with someone outside of our family coming with us.

I've met this person many times and she really is annoying. I really don't want to go if she's coming with us. But my mom really expects me to come and if I just say I don't want to right now after she has informed me about taking one of his friends with us, she will probably know I'm not coming because of this friend and she will be pretty pissed, because it happens to be a very good friend of her.

But I seriously think it would suck if she came with us. So, is there a nice way to tell my mom I don't want to come and to also tell why I don't want to?

[PJay]

Damn I can think of people like that.

I don't think she's going to like it however you try to wrap it up. Make it obvious you really want to go with her, you could try guilt " don't you think it would be fun if it was just you and me" ? :-D

Good luck.

[Zazu]

Just tell her that you don't want to go because of her friend and go from there.

If she gets pissed off about it, I feel that she would be placing her values in the wrong place anyway (with a friend, not her own son). Just be honest with her.