People, through their collectives, have the ability to recognize stimuli and have a sense of what practice is appropriate as a response. Weird people are those who do not have a sense of the appropriate response to particular stimuli or who do not recognize the stimuli in the first place and therefore do not respond to that stimuli appropriately. Weird people are also those who end up giving all the wrong signals and therefore end up generating reactions they do not expect (and thus they feel misunderstood).
Weird people are those of us who are not included in the private (collective) joke or who do not find funny what others think of as hilarious. Or they try to be funny but are hopeless at making people laugh. They do not know the correct punchline or do not know how to deliver it.
No one is inherently weird. We are only weird in relation to a collective. To be weird is to be inadequately familiar with the codes and corresponding sets of responses.
It is not easy, however, to learn the codes and the appropriate responses because these can only be learned through life-long practice and mostly through subconscious learning. A transplant (someone unfamiliar with a collective's sense of appropriate and inappropriate behavior) will always end up engaging in practice in a different way simply because it is difficult to leave behind your upbringing or social formation. A Filipino may look Thai but will speak Thai with a Filipino accent (especially if the Filipino is old and in tagalog we say, matigas na ang dila)