It's not your imagination. Guys almost never help other guys with heavy stuff unless they are specifically asked. But they will immediately help a woman. This seems to be another "guy rule" I was clueless about. My brother educated me about this like he has other " guy rules". There is this guy who lives a couple of doors down. He's my age, about 6 feet tall and looks about 100 pounds. I'm sure he weighs more but that's what it looks like he weighs. One day he was unloading big bags of something from the back of his truck. They looked kind of like bags of mulch for the lawn only bigger. He was having a lot of trouble unloading them. You could tell they were almost too heavy for him. I asked Tyler why he was just standing there and told him to go help the guy and that the bags wouldn't be anything for him to lift. He said because the guy was doing ok even though it was hard for him and that he didn't want to embarrass they guy. I was like, embarrass how?? He said unless the guy is older or disabled, having another guy, especially one who's bigger and more jacked offer to help lift something is pretty much an insult. I told him he was crazy and that I would try to help him then. He said " you? You're a small girl. You might as well just cut his balls off if you offer to help him". I found the whole thing just ridiculous and asked my dad about it. He said that it was true for the most part and especially among younger guys. For such simple creatures men have very complex rules of conduct.