No, the word fag is not appropriate for an international (read: audience whose English and perception of English most closely resembles American English) PG-13 site in almost all circumstances, the big exception would be threads about smoking. <insert rant about influence of American culture here, if you must>
To claim context for the combination “Muslim fag” strikes me as a nice try but no cigar.
EDIT: Of course if you feel otherwise, you can put out a warning notice. Like: <british></british>.
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