Boy, in the past 2 years I have gone places that I thought were clearly in the unspeakable zone. A lot of the times I tested these zones via written communications first. There is a certain comfort and protection in doing it this way, but like everything there are risks too. One risk is that you are often left with waiting for a reaction or response and in my case running worst case scenarios over and over in your head. Another disadvantage is that the words and meaning conveyed by them might not be initially interpreted accurately. In face to face exchanges body language and other things help convey meaning and context. Some times written exchanges require more work and tolerance to really get to a position of understanding.

Honestly, I think Ts are really skilled communicators who are good at handling miscommunications and don't get offended easily. Be patient, even if by slim chance you did enter into some thing offensive, your T will handle it openly and directly in a way that you will benefit from.