I hate the London System
The White tries to play the perfect game, and that's terribly boring.
It shuts down any serious attempt at dynamic play. The London is anti-chess
I played in several classical games , I am a sinner too 
Which chess opening do you hate the most?
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Mar 27, 2025
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#3
Any opening where my opponent clearly just wants to get it over with from the very beginning. But, it's funny when they can't back it up and make the most hilarious blunders in their attempt to spearhead an early, undeveloped attack, allowing you to clobber them with a proper attack. (Which generally applies to almost all of them, if you know what you're doing.)
Aggressive play is a thing. But these people...well, they're no Mikhail Tal, that's for sure.
Chess is a game of patience. If you don't have patience, you won't succeed.