First of all you need to get a point, that it's an off-meta build. It was made long-long time ago but I returned in new season and didn't find any updated version of it for this meta. So.. play it on your own risk.

But let's pretend that you're the Ashe fan same as me and want to play it on support no matter what. Then you need to get another one thing. You are very dependent on your ADC and items.
Your ADC determines how you will both go through the laning phase. If your linemate is agressive to you because of a bad pick (really happens), and you trying to do your best, but he's refusing to play normally or even worse - doing nothing besides CS under tower. You can write that line down as a loss and go roam. Do your best, if you know what you're doing. Try to help every single lane. And only come back when you can get solo exp.

Anyway!
What if your ADC is not against your pick? And you both desided that you will have a great time with each other. Than you should think what can you do on lane with your pick. For example.. if they have melee support or adc you can easily go AD build, because you will have a lot of space and time to AA at least one of them. Or if you have Karthus as the only one AP in your team, you for sure don't want to get yourself an AP build there, because.. with solo AP Karthus it's easy win.
And for really really hard matchups, for example Karma+Caitlyn, you should just dodge.. I mean, if you really want to play this disguisting lane, then you have to take AP build, to try to survive the lane stage with your poke and move to midgame/lategame, where you can do something at least.


I SEE YOUR QUESTION: "WHAT IS THE POINT EVEN TO PLAY ASHE SUPPORT BESIDES THAT YOU LIKE TO RUIN GAMES TO EVERYONE ELSE"
And I have an answer. You see.. Ashe have a lot of CC. AA that makes enemies moves slower, W that slows everyone in the cone and it's one of the best abilities imho in teamfights. And her R is so good. If you can land it through the whole map - god bless you and your parents for making you.

Just enjoy the game and pretend that all crybabies are just don't exist in league, mute them. Or make fun of them!