Am I in the wrong for wanting to talk about it in private before giving our answer?

This has happened more times than I can count in a past relationship and with my partner. It is that when we socialize with other people and something new comes up, new plans, my ex and partner would do the same thing, if they did not like the idea etc they would discuss it with them more than me and then say no, for the both of us. I've felt like I can't discuss it with a partner with an audiance and that if I go up against him it is a sign of disrespect on my part. But I do feel as if my ex and current run me over. I have tried to cut in with all kinds of sentences to get his attention and let him know where I'm coming from. With my ex I never said anything, but now as I am it doesn't help, lol. Would it be wrong of me to push this further?

Am I in the wrong for wanting to talk about it in private before giving our answer?
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