I admit I do pratice chivalry to a degree. I don't think women are weak, I am just naturally protective. I do things like walk on the outside of the side walk if I see a woman or a child. When it comes to other things like holding doors I do it for everyone. Being a girl doesn't mean you can't push a door open and being a guy does not mean I get to slam it in your face. I modeled myself after my grandpa, who was big on being a gentleman and helping others, so I don't really think about doing stuff like this. It is natural to me now because I wanted to grow up to be a polite person.
Earth needs more people like this!
It should come natural to anybody to hold open a door to anyone else without over thinking that they can't open it themselves. No one in their right mind would be insulted by that. Of course, an elderly lady or someone with a pushchair will have trouble opening one of those stronger doors, so it's still common courtesy to lend a hand and I really think they'll be thankful rather than not.