A problem that is encountered frequently among people with exceptionally low social intelligence is the inability to separate agreeability from social intelligence. Those concepts are completely unrelated.

Agreeability is the need to please others and to a lesser extent seek reciprocity for kindness. Kindness lives here. This is completely and utterly unrelated to social intelligence and when signals are confused acts in opposition to social intelligence.

Social intelligence is a perceptual skill. It is the ability to both introspect and perceive the motivations of others. You can have exceptionally high social intelligence and still be a cold asshole.

For people with exceptionally low social intelligence they lack the perceptual skills required to both introspect and discern the emotional communication of others. So... they may confuse that with something else, like kindness, where they strive to fill an unfillable gap.

It is fun talking about this with my wife. I am a software developer and software is staffed with males with low social intelligence at a much higher rate than the population at large. My wife works in education and its the same thing there for females.