Why are new nurses treated poorly?

I am a new RN. I am also a 46 year old man. I graduated in May, passed NCLEX and started work in July. I started in a new nurse bridge program that was basic but nice and informative. I worked in several units before ending up on a cardiac/pulmonary stepdown unit. I have been there 90 days. I still feel as though there is a lot of knowledge I am lacking. About 2/3 of the other nurses on the unit are great. They offer support and are very willing to answer questions. The other third are condescending and just plain rude. Giving report is the worst. I work hard to prepare for the report. I try to anticipate questions. I give more information than I typically receive. It feels like an interrogation. They inevitably ask a question I don't know the answer to and then they sigh and say things like "Don't you think that's important to know?" For example, I told the oncoming nurse my patient had an aortic valve replacement. She asked if it was tissue or mechanical. I didn't know and she made me feel stupid. She could have used this as an opportunity to teach why that was important to know instead of being mean. Sometimes I wonder if this is personal, if they don't like men, or if it's just because I'm new. Whatever the reason, it's getting old. Any advice?