Earlier quoted context omitted.
Why do you care to connect with another human? Try to feel his emotions, what he tried to express? If you see no value in that, there's no discussion to have, honestly. For most people I know there's value in connecting with others and emphasizing with their emotions
But they just said they don't get what emotions are meant to be expressed, so how can they try to feel his emotions?
> There's a story that, IIRC, was told by Brian Enos, where he was practicing timed drills with the goal of practicing until he could complete a specific task at or under his usual time. He was having a hard time hitting his normal time and was annoyed at himself because he was slower than usual and kept at it until he hit his target, at which point he realized he misremembered the target and was accidentally targeting a new personal best time that was better than he thought was possible. While it's too simple to say that we can achieve anything if we put our minds to it, almost none of us are operating at anywhere near our capacity and what we think we can achieve is often a major limiting factor.
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Art is nothing like shooting. My first instinct looking at Guernica is that I also feel nothing, but one can limit oneself and say: if I feel nothing initially, I will feel nothing at all. If you prime yourself to be open to an experience of putting yourself into the shoes of the author, you might start feeling something.