I was under the impression The Townhouse was a "Gentlemen's Club" and had escorts among the cliental. That is not what I'd call a neighborhood gay bar that caters to the LGBT community.
And since you asked I'm 61. So yes I've seen plenty of establishments the world over that only cater to men and other only to women (some lesbians hate men or simply want a space for themselves) and others yet only to Trans/Cross Dresses and the "Straight"/Bi men that pursue them. (They don't like it when gays or women enter because it scares the already nervous "straight" guys away, nor do they like competition).
I don't know how young you are or how much you've traveled but yes in my days these were not uncommon! Yes your average bar would welcome females, I even saw them in Gay Male Strip Bars, and Gay Porn Theaters like "Nob Hill" and "Campus Theater" in San Francisco and in some in Vancouver Canada! I was surprised and it was awkward but yes there they were in a sexual venue and allowed in, no problems. Again, this The Townhouse club struck as a different kind of establishment. Obviously I'm wrong.