I'm very much against genital mutilation as is practiced in some muslim countries and support bans against such practices in the west. Does that make me a xenophobe?
No, it doesn't. One can oppose (religiously motivated or not) genital mutilation on purely humanistic grounds, completely divorced from any religious concerns.
Banning building minarets has no such justification; just blatant xenophobia.
I guess where you come from all building codes are blatant xenophobia, because there can't possible any other reason as fear from stranger to disallow some buildings.