These things are sometimes dangerous.

I have had Americans use "what the British mean when they say ..." on me and colleagues and it has backfired badly.

If it were a condescending guide for "how women think" (for example) then it would rightly be thrown out as trash.

Turns out that people are individuals and generalisations of "You are X so you are thinking/will do Y" are not useful.

Use with caution.