@roger,
The argument (I'm sure, without bothering to click the link) is that without selective pressure there is no evolution. In the Western World, except for severe deformity there are virtually no impediments to procreation. Almost everyone reaches adulthood, almost everyone is capable of reproduction. Not saying I buy it, but I'll bet dollars to donuts that that's the contention.
Now, when I was getting my biological precepts poured into my head, evolution was defined as "change in frequency of alleles in a population over time." Given global travel, varying reproduction rates between populations, mixing of previously isolated ethnic groups -- and the inevitability of ongoing mutation -- there must be new alleles coming about and changes in their distribution throughout human populations, so based on this definition evolution must be ongoing...