Anarchist here. You don't get taught to hate MLs, you just get exposed to a lot of MLs making aggressive and ill-informed arguments against anarchism and it gets on your nerves.
I don't hate Lenin either, even though his writing is full of the same sort of thing, and I don't particularly disagree with him about much. I think tankie vs anarchist is mostly a disagreement about definitions tbh.
Yeah, but anarchism is a type of communism. It's not like society teaches you to hate Marxism-Leninism but not anarcho-syndicalism. You aren't going to become an anarcho-communist but still hate other branches of communism because society told you to communism is bad.