A problem with the subtext of political correctness?

Hello Rabbi,
Recently, I had the opportunity to reflect on the fundamental principle in the context of political correctness and came across a problem. I think the rabbi would agree that the fundamental moral principle underlying this concept is: “to lie in order not to harm people.” When I asked myself – according to Kant’s categorical imperative (which I tend to hold to), or at least according to one of his formulations – is this a principle that I would want to become universal? I must say that the intuitive answer that came to mind was yes, and I didn’t even have any problem with it. That is, I can imagine a situation in which people lie to other people in order not to harm them. Furthermore, most people I listen to, when they talk about the problems with political correctness, usually argue about the consequences and harms to which it leads and therefore it is problematic/immoral. But if I am a deontologist, I cannot zigzag between the two interpretations according to my needs and agendas. As the rabbi often said: “If something is true, it is true. Are the consequences problematic? Let’s deal with them,” and I completely accept that. So, I have to judge the problem in deontological terms, but I don’t really feel a problem in principle with lying to people in order not to hurt them. However, the matter is a bit more complicated, because the principle includes two very important moral obligations that conflict with each other: on the one hand, “not to hurt people” and on the other, “to tell the truth.” I have to say that I’m pretty stuck here. How do you decide between two equally important values?
thanks