I think the critique is simply the homogeneity of the people; mostly in terms of temperament. People with stable jobs, working hard, doing white collar things. Having white collar interests. 401Ks, keeping up with the Joneses, what rate did you get for your mortgage as dinner conversation and all that.

It's really not as colourful as the melange of labourers and aspiring artists in multi-ethnic neighbourhoods with historical communities.

These are gross caricatures, but my impression is that's why people don't like gentrification.