How could you have one? You have inflected nouns and adjectives -- you'd have to come up with new endings for those if you could use neither masculine nor feminine ones (not the neuter ones in case that this were offensive in German). And teach everyone to use them.
English is in this weird place where pretty much the only morphological remnant of gender is in the third person singular personal pronouns. Even if someone felt that to be a problem in general (not everyone obviously does), in other languages, this is either a non-existent issue (say, in Finnish), or an outright unsolvable issue (say, in Slavic languages). So basically English speakers get the benefit of even being able to virtue signal just with tiny language changes that cost you very little. Pretty much nobody else has this option to begin with - either lacking opportunity (like in Finnish) or the ability (like in Slavic languages).