Ok...I'm new sorry...
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Don't worry about it. They're just trying to help. A lot of us get worked up over the "inch per gallon" rules, partially because they're worthless and end up causing as many, if not more bad experiences than good. And also because the "pet" industry & many stores still perpetuate such a flawed method of determining proper stocking levels for tanks, meaning that more people believe in such calculations, which means that more tanks get overstocked, and more fish suffer as a result.
Basically, they're upset with the inch/gallon rules, not the fact that you asked about it. The fact that you asked shows that you care about the fish you keep, which is easily the most essential thing for keeping a healthy happy tank. You'll see it fairly often around here, people tend to get a bit heated and opinionated about the subject being discussed, myself not excluded. Just do your best to look past any suspected rudeness, snideness, sarcasticness, etc. and focus on the actual point they're trying to make, and don't take anything personally, because 99% of the time, it's not meant that way.
The more you ask, the more you learn, and the happier your tank inhabitants are. So keep asking away!