the reason why brahmins do not give houses to non-brahmins is predominantly due to "uncleanliness" of the other (if i may use the expression without hurting anybody)... coz, the brahmins are highly disciplined in their habits and manners and anything against it immediately gets their dislike...
also, probably if you go through known friends, am sure that they would be inclined to believe you...
i have a house in coimbatore and even though we preferred brahmins because of obvious similarities in living style, we let it to a vegetarian non-brahmin... so i think it is rather an individual preference that matters in these things which should not be considered as "social distancing"...
we have several family friends who are non brahmin vegetarians and we treat them equallly...
i believe that you are confusing individual preferences to societal co-existence!
