Basically the title. Not only is it such a niche and complex subject that most people will think you are a weirdo for spouting anything about it, it’s also a theory largely revolving around human relations which again will make you seem like a total weirdo for seeing what is supposed to be dynamic, natural and unique - human interaction, as something that is somewhat predictable and predetermined.
The closest I’ve ever got to speaking about socionics in real life is with people who are relatively well-versed in MBTI, but even then being interested in socionics demands a certain depth of knowledge which being interested in MBTI doesn’t, so most of the time it’s very surface-level conversation.