1. You show your ignorance of the subject. Historically passing through "Customs" has nothing to do with being a legal or illegal alien. "Customs" has to do with imports brought into the country... fruit that might have insects, drugs that are illegal, liquor that should be taxed, that originated in a boycotted Cuba, etc.
2. Calling illegal aliens is equivalent to calling me a "criminal" for exceeding the speed limit. I speed and accept no negative label until the police catch me. And then only when I plead guilty or am found guilty in court. When I am let go with a "warning" or a "traffic school" that does not go on my record, I am not a speeder in the eyes of the law.
The same is true of illegal aliens. To deny otherwise is to be out of touch with reality.
Yes, there are problems with immigration. But arguments are not advanced on our side with over-the-top Al Sharpton type hyperbole.
You will never get anywhere with these arguments with some of these people, and the fact that you are right only pisses them off more. Keep it up and they will accuse you of being a DU troll.