I _feel_ like that this is a pretty common practice in our industry.
At a previous employer, we had someone who was dyed in the wool Republican that was outspoken in his personal life about "the blue line" and "all lives matter". When it came to a discussion for a promotion for a senior engineering role for this individual, we had another manager who felt uncomfortable having an employee with the views this guy shared. Mind you, at work, he was pretty polite and you only got an insight into his life if you accepted his friend request or saw the bumpersticker on his car in the garage.
A concrete example is Brendan Eich who was forced to resign in 2014 as Mozilla CEO over his personal contribution of $1,000 in 2008 in support of California's Proposition 8 (a now-overturned 2008 gay-marriage ban).
At a previous employer, we had someone who was dyed in the wool Republican that was outspoken in his personal life about "the blue line" and "all lives matter". When it came to a discussion for a promotion for a senior engineering role for this individual, we had another manager who felt uncomfortable having an employee with the views this guy shared. Mind you, at work, he was pretty polite and you only got an insight into his life if you accepted his friend request or saw the bumpersticker on his car in the garage.