I don't know about actively avoiding, but I have worked for multiple companies in London who prefer not to hire at the 'top' end of candidates (hence hiring me!), because they'll cost more and can have cultural issues like not be very fun people or thinking themselves to be above the self-taught and weird-career guys who didn't get a first from Imperial.
There's lot of anecdotal chatter and also mainstream media coverage on this.. It's a genuine concern.
But bigger issue is in USA where general jobless numbers are lower, with several sectors facing shortages, why is there the issue of grad unemployment at all.
The correct answer is important because politicians are filling the vacuum with false narratives to suit their base.