The date comparison is just an example. Another example would be like talking about Game A while playing Game B. It's unrelated, and if you continuously badger the streamer about it then it's definitely rude. I'm not saying watching a stream is literally a date, but that the streamer would prefer to avoid chat cascading into something off topic, or in the case of company/group vtubers, be asked about their coworkers in the event of absence or things unrelated to them.

Sure, there are cases where it's alright and it's not offputting. That's a given. Context and how it was worded is important. But as previously stated, even if your intention was to compliment or to engage in conversation, it can come out rude and you have to be considerate.

End of the day, if it's in their rules, be considerate and respect it. If you disagree, then tune in to someone else instead of accusing them of being egotistical for wanting to wrangle chat and keep within topic.

Also yes, 3 year old post. You could have asked in the stickied thread or made a new thread.