Characters are supposed to influence each other's roleplay. How can they not? The issue has always been with players influencing people's roleplay through out of character issues and now you know that other people are touchy about the subject you can always check first that you're not doing that. I don't think anyone will ever have issues with reacting to what other characters do actually in character on missions and if they do then it's their problem because they're the ones not willing to roleplay...