4x or so in my case. Same thing, though.

Most of the time it boils down to “I can’t be arsed”. Stuff like:

• I’d need to rephrase it to still say what I think, without being impolite. I know that I’m an arsehole, but I’d rather not ruin someone else’s day if I don’t see a reason why.
• I’d be dealing with someone who’s clearly irrational and/or disingenuous.
• I realise that I’m taking into my own hands some matter that someone else is better prepared to. For example, explaining a subject that I’m not too certain about.