though no offense may have been intended "son" has been used as a derogatory term in the past and without the benefit of seeing your expression and hearing the tone of your voice it is entirely possible that it could be taken the wrong way.
I agree with you that gun ownership is a large responsibility and educating yourself beforehand does a great deal to empower a first time gun buyer and helps raise a red flag on unscrupulous salesmen that are looking to earn a quick buck by preying on an uneducated young man however there is a time and a place for everything and pushing one topic while another is being discussed may serve to intimidate or confuse rather than the intended purpose of helping.
ignore my complete lack of capitalization. I still have no problem correcting your grammar.
I never said half the crap people said I did-Albert Einstein
You can't believe everything you read on the internet-Benjamin Franklin
Bean counters told me I couldn't fire a man for being in a wheelchair, did it anyway. Ramps are expensive.-Cave Johnson.