The pronunciation of abbreviation FAQ is not uniform (cf. What is the commonly accepted pronunciation of FAQ?). One of commonly encountered ones is /fæk/. This one, at least to my untrained, non-native speaker ear sounds really close to the word
The etymology of the abbreviation, coming from the early and wild years of the Internet of the 80s, might suggest that this similarity in pronunciation was not a coincidence. Referring other people to read the FAQ might have been a tongue-in-cheek way of telling them to "go away" (though I have not found any source to corroborate that little theory of mine). On the other hand, the abbreviation is used now even by "serious" entities, like the European Commission (e.g. here).
Is this similarity in pronunciation recognized by native speakers as well? In other words - does the word FAQ have a slight vibe of vulgarity? If it does - is it probable that a person might feel offended when it's used in (probably official) verbal or written communication?