For people who truly are outside of the norm, this will be true wherever they go and if you need to ask the question “am I normal” the answer is almost certainly yes.
Many many years ago I had a close friend who was unable to hide his personality from society, despite me urging him on many occasion to understand what norms are expected and adapt his behavior, which unfortunately he viewed as a cop out and a form of dishonesty. Consequently he spent several years in a mental institution where I think he was described as psychopathic schizophrenic.
A label to be sure, and he seemed more destructive to himself than anyone around him, also had an incredible insight and intelligence that was off the chart. A perception that not many would appreciate, in fact more often than not, quite the opposite.
So, for people that have lived in another culture for an extended period of time and have blended in, made friends and adapted to a new culture (as opposed to those foreigners who despite living in another culture surround themselves with friends and things from their own culture). On going back to their own country, can often get a sort of culture shock in reverse.
Quite likely there has been some shifting in perception, and its a perception that is not shared by the majority that make up what constitutes the norm. We’re not talking about such massive shifts in perception and behavior as was the case for my poor friend who society felt required to removed from their presence. But it is deserving of being somewhat mindful.