Personally -- and I'm not trying to make excuses for obnoxious behavior -- but I think "port begging" for PC versions is often times understandable just in terms of trying to understand what the status of it is. Port begging as far as I'm concerned is problematic when the system wars stuff distracts from discussion about the game. Like when it's clear that First Party X has secured exclusivity for Game Y, there's no point in whining about how you want it on System Z. It's not going to happen, at least not as long as there is an exclusivity deal in place (after all, some of these deals are timed). But when a game is announced as multiplatform but with no PC version, I don't think it's unreasonable to ask about the status of a PC deal. After all, there's clearly no legal reason why such a version doesn't exist. So many games get PC releases nowadays.
Now if the developer does clearly state that there are no plans for a PC version now, I would agree that it doesn't help anything to derail conversation whining about the lack of a PC release. But I just think initial inquiry about the possible release of a PC version isn't problematic.
To put it another way, there's a difference in my mind between a genuine search for clarity and whining because you aren't getting your way. Something like "will there eventually be a PC release?" or "I hope it releases on PC some day" are worlds apart from something like "What, no PC release? Fuck those clowns!"