Now that you mention Reddit, I've abandoned it because that cesspool is overflowing. It's no longer just the obscure subs, misogynist thrash from mainstream subs is hitting the front page on a daily basis.
If you stick to subreddits thing are much better. For example, I lurk on r/rust a lot, and like other high-quality subreddits they have a stickied code of conduct to establish the ground rules. And the community there is extremely friendly and encouraging.