Next time you hear that comment about your supposedly being a 'woman' for wanting a long term relationship, pause a bit, maybe take a breath and let go of any anger toward the person saying that, then look him in the eye and say,

"No. I'm a real man, I'm comfortable being how I am, and I know what I want."

If you don't feel prepared to debate further, just say,

"It seems we don't agree. I can only speak for myself, and I know what I want."