I’m not sure if this is just another way of saying what others have said, but I also upvote if something accomplished the theme of the community. The example that comes to mind is from the other site, but if something on r/mademesmile actually made me smile, I upvoted. As for downvotes, I usually save them for posts that I want to be less visible for whatever reason. Sometimes that is because I disagree sometimes it is because they are reposts, or low effort trolling, etc. Right or wrong, that’s how I do it.
I misgendered a woman who was already very irate. This was probably 30 years ago, before trangenderism was as common as it is now (or at least as publicly presented). It did NOT go over well, to say the least. Other customers were smirking and giggling, and even a coworker was having trouble keeping a straight face. In my defense, she was heavyset, had shaved hair and a raspy voice. Luckily I didn’t say any of this to her. I just got my manager and let her yell at me (and him) for 10 minutes. I learned the value of keeping your mouth shut until you’re certain that day.