How much does it annoy you when flutherers go off topic in your thread?

And by “your thread” I mean the question you asked…This has been happening to me a lot lately. Sometimes I mention it, other times I don’t, but either way, it bothers me. One or two off-sides are okay, but when half of the thread does not pertain even one iota to the question, it irks me. Does it get to you? Should I just bring it up and ask it to stop?