Guys are protective of their girls, whether it be a friend, sister, girlfriend, mom, granny. Guys are not allowed to cry in front of girls or mention crying or even refer to songs that mention crying (unless, like Guns 'n Roses' "Don't Cry" the song is specifically about a woman crying or, of course, not crying). That's why we'll never watch "Rudy" with you.
Girls, however, don't carry that burden. Men are more sympathetic to weakness in women than women are to weakness in men. Not that crying is weakness, but being down, sad, scared are much more acceptable for a woman than a man. If you're upset, then your guy friends will want to comfort you.
As to being walked on by others, that would make your guy friends angry (unless they're the ones doing it, then they're just jerks) and, if it's a guy, likely to fight. If it's a girl attacking you, likely to stick up for you. The catch is that we are also, when you tell us about something that happened earlier, likely to tell you what to do, how to handle it.