To be fair though, sincerity without empathy is just assholeness. There are way to many people justifying their asshole behaviors with “being sincere”.
Sometimes there are moments where some people have different life experiences which lead to different stimuli of insight. These people may potentially take criticism roughly and may need some easing and gentleness. Such people may have the tendency to withdraw or lose confidence upon hearing relatively short messages with no emotional context and then perceive them having negative intent or feeling that they are not worth you time. They may want to talk to sit and form connections instead of pure efficiency of communication. (/s?)
That is true. And on the other hand, or perhaps just by handling their experiences differently, we have those who dislike or even might be offended by being "babyed" or carefully handled/talked down to, and would much rather have an up front interaction where they feel mutually respected.
Both kinds of people exist, and that is fine. One must just not mistake soft language as universal tool that can be used everywhere, or risk standing out as an "asshole".