I agree with previous people, in that I feel like those guys who identify as "total tops" still experience internalized homophobia -- they feel as though if they become a bottom, then they lose their masculinity and truly are "gay", and therefore have to embrace all that goes with being gay (if there is anything). If all they do is top, then at least there is still some modicum of respectability, at least in their own minds -- the "a hole is a hole" attitude.
Fine -- if you want to be a homophobe who fucks guys, that's your business, but don't you go after my ass! Indeed, for me there is little else that is a bigger turn off than to hear a guy say "I'm a total top", especially since, in my experience, those are also the guys who don't kiss and don't suck. If you're going to have sex with a guy, actually have sex with the whole GUY, and don't treat him like he's just a hole. If that's the case, drill a hole in a tree and use that.
As far as the top/bottom dynamic in a relationship, it is my belief that a relationship is about give and take, and the ability to compromise and both bring each other pleasure. If one guy prefers bottoming and one prefers topping, and those are the usual positions, that's great, more power to them. But when one guy refuses to bottom, or refuses to top (refusing to bottom seems more often the case) then there is something seriously wrong with that relationship, in my opinion.