I hate undertones in conversations cos I never get them, like when people ask your opinion on something with an answer already in mind then you give a completely different one, if you already knew the answer you wanted why did you ask?
Thats one of the reasons I think I come over quite when I first meet some people, cos I have to gauge what I should say to them.
But I think the bottom line is you know your not saying these things to be nasty and when people get to know you they understand to i've found the best thing to do is just try and hold fire and think about what your going to say it.
With the added bonus of making you seem thoughtful and a bit enigmatic