As a general statement, people can give advice and factual information without it being an attack on personal habits, and you are perfectly welcome to disregard any advice given if you choose, no excuse or defense of your actions needed.
Aum, does the vinegar leave a smell behind or any other effects outside of the intended ones? My boyfriend has had trouble with dandruff and Head and Shoulders doesn't always work very well and it bothers him, so I might suggest it, but I don't think he'd appreciate smelling like vinegar all day either.
The percentage you're paying is too high priced
While you're living beyond all your means
And the man in the suit has just bought a new car
From the profit he's made on your dreams