Well sure, but this isn't just a tech thing. At conservative petroleum companies, those who disagree on politics say they're isolated too.
I can imagine they may feel isolated in the sense that their views are not very common. But isolated in the sense of, if I let on I voted for Obama I will get fired? I am very skeptical of that.
My experience of these issues is that one part of society has become exceptionally intolerant far beyond other parts. I do not hear stories of conservative companies engaging in mini civil wars and retribution firings over liberal memos.