i think what the parent was saying is that (s)he is trying to avoid any possible ding. it's not that all employers demand 100% propriety (well, some do, but we certainly don't) -- just that, when browsing through a list of comments haphazardly, one errant comment, now out of context, might affect the perception of the candidate. in a tight labor market, that might be enough to put one candidate above another.

it's similar to the need of all college grads to clean up their facebook profile.