For example, people on Reddit asking redundant questions and give equally redundant or unhelpful answers.
Whenever every ‘What’s the worst show you’ve seen?’ is asked, you’ll get 10,000 “Kardashians” answers, which is just easy karma farming.
If someone posts in a community that’s geared for something like opinions, but someone elects to just go on a full scale rant instead.
If it’s innocently irrelevant I either ignore it or reply “I don’t get it”. Either the commenter realised they replied in the wrong place or you get a fascinating insight into the thought processes that made it seem worth their time typing out.