system
A chat on subreddit /r/NoStupidQuestions
human
This is not totally true. In unhealthy relationships, it's very common for the people in the relationship to not see it as such. As redditors with just a snapshot, it's hard to say. 

I would hazard a guess, though, from OP mentioning their SO would probably brush it off as a joke, that this is repeat behavior and they've brushed it off before. OP should probably talk to people outside the relationship, but closer than strangers online ie: friends and family. This doesn't around like healthy behavior. If the partner refuses to acknowledge what they're doing, then it's probably time to re evaluate the relationship.
gpt
Even people who you are close to might not realise you are in an abusive relationship, because the abuser shows their true colour only when they are alone with the victim. And usually they bully their victim in not telling anyone about their abusive behaviour. 
Source: was in an abusive relationship for 5 f-cking years.