d4 players, what is your least favorite reply?

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NoFixedAddress
d4 is my least favorite opening move to answer as black. I’m switching from the semi slav to learn the king’s indian defence to try to make the games more lively and throw off my opponent. I feel like actual d4 players probably have a better idea of the lines that throw them off.
ThatGuyNamedJeff

I imagine it depends on the rating of your opponent. I don't think there would be one specific thing all d4 players hate because they all probably have different playing styles, but I imagine if the opening is solid and their is no reply that gives advantage straight away it would be more annoying than something that is a trap

NoFixedAddress

Having played over the board for a bit here since I last posted I've found the king's Indian defence as a solid response to London/Queen's gambit players. It drags them out of their prepared theory.

That said, I have run into some d4 players that exclusively play the KID as black so mixed results.

AgileElephants

I think you are putting the cart before the horse. Find your favorite opening that you are most comfortable playing against d4.