"The argument against H1B isn't an argument against immigration or immigrants..."
Whatever the "arguments" may be for or against, the policies that fall out of those arguments have an impact on immigration and hiring practices.
-- So are you saying we should let H1bs start companies and not be reliant on the job?
-- "It isn't surprising that many companies are founded by immigrants or children of immigrants."
50% of the company is not immigrants. 50%! That number is mind blowing. That is much higher than the country as a whole.
-- "startups valued at more than 1 billion dollars? OK..."
?
-- "those dollars in the economy are concentrated in hands of the very wealthy"
You think immigration is to blame for income inequality?
-- " I have a hard time believing "
This is not an argument. You're just asserting that he is lying without any argument.