The question isn't whether someone has the ability to call his point an overgeneralization (i.e. wrong, misleading, actively harmful, worse than useless); the question is whether it actually is or not. When faced with overgeneralizations, the most useful thing you can possibly do is to point out examples where those generalizations don't hold:
- It helps you by preventing you from accepting the false statement — you learn where it's true and where it's false.
- It helps other readers by preventing them from accepting the false statement, and in blatant cases, pointing out that the person who's writing is just trying to get traffic to their blog rather than writing something of value.
- It helps more careful writers by diminishing the reputations of the ones who are just bullshitting, which counters the audience-getting effect of boldly stating bullshit to some extent.
It's probably true that you can get traffic to your blog by making bold generalizations without any concern for whether they are true or not. The question is, what can we do to fix that, so as to reduce the temptation to jettison intellectual honesty in the quest for attention?