It's okay, and it really depends on which subreddits you're looking around in. I've only regularly looked around a handful with varying amounts of people joining them. In the smaller subreddits, they're actually chill 95% of the time.
As you progressively go into other places where there are many people hanging around there, it can get pretty bad, with some even abusing the downvote function on comments that aren't even offensive in the slightest. Moreover, I noticed that hivemind can be prevalent at times depending on the subject. And let's not get started with overused jokes. Ugh, I've seen some of them repeated so many times over the course of a year that I just roll my eyes.
Personally, I'd rather stay away from subreddits that have a large following. Of course, no place is safe from toxicity, but it's up to the people with negative attitudes to change up the way they act on the internet, which I think is very unlikely to ever happen, unfortunately