I feel like those statements against Google are
also most likely a manifestation of insecurity.
A lot of people want to work at Google, and there are always some who have to point out that it's not the ultimate prize, reserved for the best. After all, if it were a universal goal, and you haven't attained it, you must not be the best. The insecure person's solution? You don't work there, because although you could if you wanted to, you have reasons why it isn't worth aspiring to.
Although I agree with your statement, being compelled to call it out demonstrates insecurity. To be frank, some days I wonder if my own insecurity is the reason I tell myself that I don't want to work at Google ;) I'd be curious how many detractors could get an offer from Google and reject it.