I am not a "total top." That said,
1. I pay attention. I find topping a big-dick bottom very hot, even hotter if he is bigger than me, as instead of going about destroying other guy's holes, he is instead submitting to my dick to get his rocks off. I chalk this up to being a switch who loves a number of role reversals. I also prefer the guy bottoming to be hard. But would I turn away a bottom for not having a big dick or getting hard during? HELL NO! It's not a turn-off. I just like seeing a dick bounce while I'm inside him, so the more there is, the more I get to feel up/see.
2. A major reason why I am gay is because I love dicks, getting them off, sucking them, playing with them, touching them, etc., so I like average sizes too. I am more likely to bottom for a small/average dick than I ever am for a big one. I understand many guys that bottom want to be destroyed, but that is not me, lol. Furthermore, I'd rather have a dick I can fit into my mouth without having to have lockjaw and that I can use in some way.
3. Honestly, I feel like it is etiquette. I'm like, what's the purpose of a guy I'm messing with to have a dick if I can't/he doesn't ever play with/acknowledge it. You don't necessarily need to fuck anybody with it, but I feel a bit saddened if a gay man with a dick doesn't have some sort of relationship with it. Like, I'd take a second dick, lol. And though slightly off topic, I feel if you are in the small percentage of "total top" or gay men who does not like dick (well, anybody else's dick than your own), you should have no problem messing around or being with a cute ass transman cause you are essentially saying having a dick does not matter. If it matters that the guy(s) you are topping have a dick, acknowledge it, give it a grab; after all, you obviously like dicks.