Don't is a shortened version of do not. When you say don't, do you pronounce it as do not or do you say doe-nt ( I'm not sure how to sound it out). The English language is complicated, saying toots would not be correct in terms of the English language. As we shorten the word to Tut/Tuts, the U makes an uh noise. I don't even know if all this makes sense, I'm at work, it's early and it's Friday ?