Myabe the problem is that they feel you need to earn their respect. Now if they were to look at differences in strength for men vs women they would respect you more, but maybe its as simple as they are looking at it from the stand point of what do THEY get out of riding with you. Obvioulsy you get pushed hard, but they may view you as simply a wheel sucker that is disrupting the rhythm of their paceline. Don't get me wrong on this, maybe that isn't what they think, but maybe it explains their coolness. I agree they should be friendlier, but only you have to decide if what you get out of riding with them is worth the cool behavior. But don't stress over it. Just make your decision, and understand its not personal.