Under no circumstances do it in a complaining vein manner or indulge in nit-picking. The people who have put the rules together have done so with a great deal of thought and based on a lot of experience. They have tried to write the rules in such a fashion that they can be easily understood and applied with maximum fairness to all competitors. If you disagree, explain why and suggest a better terminology. Your contribution is most important.
Some officials are reluctant to admit their lack of knowledge and, as a result, never learn.
No one is born knowing all the answers and they can't be acquired in one year of association with swimming or two or three years. Unless you are sure you understand the rules and can distinguish between correct and incorrect form, you will spare yourself criticism and avoid doing an injustice to the competitor by declining to serve in a capacity where you can disqualify competitors. Fairness should be the key to official decisions. Rules are created as standards of perfection and should be enforced as much as practical and reasonable and to the degree that they must be to protect all competitors. Marginal deviations from prescribed form should be viewed leniently provided they are involuntary and give no advantage to the one who commits them.