That's not a race issue, that's a corporate culture issue.
Like you said, check the reviews from Glassdoor about those companies. You'll see how many people complain about work / life balance and shytty work conditions. I'm willing to bet that most of those people filling out those reviews are white.
Could have very well been corporate culture. It was just weird because I had a screening, a technical interview (with problems to solve) and an on-site and just the personality of these people were so
I mean maybe you're right because much larger companies have personalities too.
Living where I live you run into those "brogrammer" types and of course in tech you run into the brilliant a$$holes.