And it is not true (for any reasonable reading of the quote). There are very popular languages that don't get the deserved hate that C++ does. Sure, Python is slow, packaging/versioning is painful, but it is nothing like C++ complaints.
I mean, a standard (and stupid IMO) interview question is rate your C++ expertise from 1-10, and if you answer more than about 5-6 you get bounced for lying or not recognizing your limitations, while they gleefully point out Stroustrup wouldn't answer 9-10.
It absolutely is true! You can certainly argue that different languages get different levels of complaints and hate, but every language that anyone uses gets a non-zero amount of complaints, regardless of severity.
> Sure, Python is slow, packaging/versioning is painful
Those are complaints. That is evidence that people complain about Python. You just did it yourself.
But maybe your complaints about C++ are an order of magnitude more plentiful than for Python. And maybe quite a few of your C++ complaints are about much worse things. But that's not the point: they are all complaints.
And that's the problem with the Stroustrup quote: he's implicitly saying that all complaints are created equal, and there's no difference between having 10 complaints or 10,000 complaints (where 3 of the first are major, and 5,000 of the second are major).
It's used, as the GP points out, to shut down legitimate complaints. "Oh, you don't like $REALLY_BIG_HORRIBLE_ISSUE with my language? Psh, whatever, people complain about all languages, I dare you to find another language that you won't find something to complain about." Not the point! Is $REALLY_BIG_HORRIBLE_ISSUE a problem or not? If not, actually explain and justify, with specific arguments, why you don't think it's a problem. And if you do agree it's a problem, stop deflecting attention, admit that's it's a problem, and try to find a solution!