When someone doesnt understand how to even deal with yasuo don't tell them to play a counterpick

If they knew how to play they'd be using it anyways

Ask them what champ they play and give them options and expected results.

also a few general things

No, do not rush against yasuoo BY DEFAULT. While there are a few champs that want to do this they are by far the minority, especially at low level. You build if its an extreme threat like + otherwise you are just gimping yourself and even among those that get regularly there are few that actually flatout finish the item during lane phase. Again that's an extremely situational item with only moderate level's of AP.

So what does one want to build against a champ who can't push without items and wastes your mana and cooldowns.. well how about mana and cooldowns instead??? this busted item is actually very effective against yasuo though this also sortof gets the job done but obviously there are some reasons you might not want to do that unless it gives amazing advantage.

again, don't just give a counterpick, if at all. mention what it is about that champ that counters him perhaps but these people wouldn't need help if that's all it took.

Another thing these people need is to understand what to do after the wave is pushed as its going to get or when they get zoned. You don't have to touch the tower and you don't have to stand there like an idiot just because there's 2 minions left. And most importantly, you aren't going to lose lane just because yasuo pushed minions under your tower and attacked it! You CAN go to base early as soon as you get gold for whatever you need.

There's a lot more to it but this halfassed "just counter him" crap needs to stop already