What shows on the surface is not necessarily what lies beneath. It can be helpful to our inner peace, and to society as a whole if each and everyone of us looked within for causation before projecting out.
Like a wave, smiling is what lies on the surface and can mask what lies beneath. Not an intentional personal trait, it is just part of who I am. Smiling has gotten me into trouble both personally and professionally. To some my smile was an invitation to come closer, and get to know me. To others it was a threat to their authority. No people, sometimes a smile is just that a smile, an inner sense of well-being shining through.
Also, I am an eye person. I listen to the eyes equally or more so then what is actually being vocalized. For me it is a truism; eyes never lie, and they are the windows to the soul. To some this is an invitation, to others there is a fear of being unmasked. In retrospect I had a compound problem; smiling a lot, and direct eye contact.
The way I saw it, I had a choice. I could blame everyone for not understanding me OR I could adopt coping mechanisms to minimize how people perceived me. Having pinpointed some of my interpersonal difficulties I learned to employ counter-body language to minimize my natural tendencies. It seemed like a much more productive solution then to have an expectation that everyone else should change.