Good point! Maybe if they can't change the prefix, the greeting could be left as a simple ''Hey,'' (fill in blank). The ''Hey'' is probably meant as an informality to put guests at ease, if they left that out as well I would personally aim for ''Hello, I/m...'' Someone else would say Hola, Nihao, Hej, Ciao, whatever suits which is a nice international feel to an international site. ''Hey'' feels quite American to me, which is of course fine as we are on an American site.
Maybe a rewording is on the cards? I am sure Air monitors the forum for the good and the bad, so there's a suggestion for you.