That happens even when theres two "proper supports" in the bott lane..... All it takes is one having a better adc.... Or one having a more aggressive support... Etc.
Ive had games where there was an entire "troll team" and we still won. Often times won hard.
This whole thing about "autofill sucks cause theres always a troll support" and thus ALWAYS blaming it on the support, no matter what, all the time.......... When was the last time you saw a "autofill made a troll top" thread? Or mid? Or jung? Or adc? Ill wait.......
Note, bott lane has twice as many chances of the enemy being better than you. If even one of them is better than you..... It can easily be the cost of the lane at minimum. If both of them are better......... Well........ The results look grim.
People keep saying support is the easiest role. Yet "nobody plays it" yet i have carried from support role as Nami. Ive done it as Blitzcrank. Ive seen it done by Thresh. Ive seen it done by Soraka because nobody has a clue who to actually target and the Soraka is playing well. Ive seen it done pretty much just by Janna even..
Your not forced to do it every game, you just get to play a different role than your main role/s every so often...... If you have an issue with this in ranked...... Get smarter. Do Ranked when you have autofill protection.... And do a normal as Support/fill until you get it back.