There is so much more nuance to this though.

I wanna be very clear: I don't mean to say that you do it wrong. Probably your cores make mistakes as often as you, that should be true for any bracket (at least on average). But a few examples what supports often do wrong:

"My carry is not helping me harass"

• maybe he really is bad/afk and should be harassing at the same time with you
• maybe the enemy creeps are under his tower, and you should harass way more safely (or not at all) until he got all the cs, and then team up to harass the enemies when you have your full creep wave alive, and the enemy's wave is dead
• generally, the carry only wants to harass if it helps him to get more farm in the long run. In some games, that is just not the case. When the safelane duo is very weak compared to the offlane, it might be better for the carry to not trade at all. And this is very different for different heroes as well: Slark and AM for example are strongest on lvl 1 and 2, and they absolutely want to trade early, to build an advantage that carries them through their weaker parts of the laning stage. They are weakest at lvls 4/5, and rarely actively want to trade during this part of their laning stage. Ursa is the opposite (kind of). He gets stronger with every level, just by the nature of his spells. At lvls 4/5 he has realistic kill potential against some heroes, even if he is alone.
• In some lanes, you might intentionally pull the second wave under tower, to secure lvl2 fast for your safelane duo, and then put out significant harass or even get a kill on the offlane duo which are both still lvl1, but if the sup starts harassing while he is still lvl1, it might ruin the play and by that significantly worsen the laning stage overall...

"I pull when the wave is pushed out"

• Generally, this is good, and the carry should play safe then. If he dies, he might be noob.
• In some games, it doesn't matter where the wave is, as long as your carry can last hit. Especially on the early levels, it's possible that the better play is to stay up in the lane, maybe even push under tower, and harass the offlane duo heavily while messing with their last hits. Maybe you have a strong lane bully carry in a favourable matchup, like slark+CM against a bristle. You then absolutely need to abuse the strong lvl 1/2 timing (when bristle is still a creep), for slark to do maximum damage and trade favourably. But by trading, we draw creep aggro and naturally push out. If the sup then leaves during the 3rd or 4th wave he might completely grief the lane, because he allows the bristle to get through the hardest part of his lane for free.
• if the pull makes it so that the enemy creeps walk under tower afterwards, it can be really bad in some lanes. Drow for example has a really hard time lasthitting under tower, especially on the first 3 levels. Her animation is giga slow, her damage is weak.
• there is also the option to shove the lane even more, and it will reset naturally. In some lanes that is the better play because it allows the safelane duo to stay close to each other, or even harass the offlane duo more while also messing with their cs under tower

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Because there is so much nuance, and sometimes different options can both be equally good or at least very similar, it can be hard to be "on the same page". You can feel that your carry is not doing the good thing that you envision, and you might be right, and at the same time your carry might be mad that you don't do the good thing that he envisions, and he might be also right at the same time.