How to counter the London

The title

Follow opening principles. Use your time wisely. Stop hanging material and slow down.

Please be relevant and kind.

At your level no one knows or understands openings. Play slower time controls, flow opening pricinples, and actually think instead of moving fast.

How is that relevant here?

You'd do better to listen to advice instead of making random nonsensical comments.

If you're such a great player on such a lofty level, why don't you answer his question instead of being patronizing in not just one, but two of your replies?

I did.

But I get it. You're just here to cause drama. You are forgiven.

Early developing bishop from c1 weakens pawn b2 so most principled lines against the London are those including early c7-c5 and Qd8-b6.

How are you being kind and how is responding to me relevant

Gently