that means some was very mean,cutting,harsh,caustic or acrimony.
if you don't like someone ,then you maybe don't like chatting with her/he,or maybe you said some words or something phony, perfunctory and sarcastic,in this situation,chinese means 刻薄。
人情sometimes just as secular tradition,like culture,like rules.不通人情means you don't abide the rule.for instance,someone(maybe you friends) be deceived because of her owe careless,then you may disappointed with her ,and another friend of you two would said to you别那么不通人情.
(我终于再一次发现自己的英语真的好烂)my explanation is really very poor,but i hope you can understand it.
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