I do that too and it seems paradoxical to me. On the one hand, I'm trying to not let my feelings overpower me but on the other I'm trying to be honest in order to help. The intention in the first impulse has always been an honest reaction to things but when the other person gets upset it makes me question my approach. I struggle with trying to be diplomatic because it doesn't come naturally to me and I end up triggering someone else. I now try my best to say things in the best way possible, I fail but I try. Meditation has definitely helped me but I think I still have a long way to go in terms of practicing conscious behaviour, controlling my tongue or my emotions.