The grand parent post clearly stated it is the poster's "rule of thumb". By definition they are aware that the rules are [likely] "not mutually exclusive". Starting with "these are not mutually exclusive", is what makes this comment so unnecessary. Don't be proud of having listed exceptions to someone's rule of thumb.
Had you started with, "I like that; these are a few exceptions I've observed to your rules that I find interesting", that would be a productive way to start a conversation.
But starting with "these are not mutually exclusive" makes you seem like an ass for having pointed at an exception to something that by definition has exceptions.
It's right in the posting guidelines [1.]
> Please respond to the strongest plausible interpretation of what someone says, not a weaker one that's easier to criticize. Assume good faith.