The Japanese has the territorial imperative.
Therefore, I worry where you came if I meet you in a real life.
Your personality,job,hobby doesn't worry never.
And, I will see you in the by prejudice. so,You are 'a foreigner'(sorry maybe bad word) somewhere else. We cannot immediately accept you. I will need quite a lot of time for that.
Therefore, we do not want to come to the site in the foreign like DA. It is because we become 'a foreigner' .
And, we misunderstand that you are looking in similar idea to us.
so, We will not want to speak with you. its from ethnicity.
The much more, if it is not good at English like me, we will keep becoming silent.Please understand it. And, never think the Japanese of DA to be bad.
We just not try to go to out from own's "Territory".