House identification after Hogwarts (or, Slytherins need not apply)

[pookasmorning]

No: HPFGUIDX 125719



I was reading some speculation as to what Houses certain adults had 
been sorted into, and it set me to wondering. What happens to House 
identification post-Hogwarts? 

The children at Hogwarts spend seven of their formative years having 
their respective house loyalties and prejudices drummed into them. 
And these aren't simply baseless stereotypes; the Hat claims to sort 
according to criteria, so they (and we) have to assume there is at 
least some basis for judging people by their House. It doesn't seem 
logical that students would simply forget that Hufflepuffs = Duffers 
upon receiving their diplomas. And given that a large percentage of 
the British wizarding community graduated from Hogwarts, it also 
seems logical that these biases would carry over into society at 
large.

So how would they affect things like, say, employment opportunities? 
If a Hufflepuff were being interviewed for a job requiring swift 
mental reflexes, would he or she automatically lose out to a 
Ravenclaw? Would a Gryffindor hire a Slytherin for a job requiring 
teamwork? More importantly, would a Gryffindor vote for a Slytherin 
(if there is voting)? Would they let their daughter bring one home 
for dinner?

In short, what are the long-term societal effects of Sorting?

- Pooka